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Russia and Ukraine have descended into a bitter blame game after a gunfire battle killed at least one person and left three wounded in the eastern Ukraine town of Slavyansk on Sunday.
The incident comes just hours after Kiev declared a truce coinciding with the Easter holidays in an effort to de-escalate tensions in the volatile region where pro-Russian groups have seized government buildings calling for the interim government to resign.
The identity of the attackers remains unclear with both sides trading accusations and blaming each other for the deadly clash.
In a statement, Russia's foreign ministry blamed Ukraine's Right Sector, a far-right paramilitary group which played a prominent role in the ousting of former president Viktor Yanukovych.
"Russia is indignant about this provocation by gunmen, which testifies to the lack of will on the part of the Kiev authorities to rein in and disarm nationalists and extremists," the statement said.
The Right Sector denied being involved in the Slavyansk shooting and blamed Russian special forces for the attack.
"It is a blasphemous provocation from Russia, blasphemous because it took place on a holy night for Christians, on Easter night. This was clearly carried out by Russian special forces," Artem Skoropadsky, a spokesman for the Right Sector, told Reuters.
Ukraine's intelligence service also accused Russia of staging the shooting and "terrorising the local population" as part of a "cynical provocation" "supported and armed by officers of Russia's GRU" military intelligence.
The country's interior ministry said one person was killed in the attack and three were wounded. It said none of its forces had mounted an operation overnight in the area, which it described as "the most dangerous place in Ukraine, in view of the presence in the town of foreign saboteurs and illegal armed groups".
It also raised suspicion about the speed in which "camera crews from Russian TV stations appeared at the scene of the shooting, and the obviously staged subject matter of news reports in the Russian media".
Pro-Russian separatists said the battle broke out at around 2am after four vehicles approached their checkpoint and opened fire.
Kiev fears Russian forces could enter the country and seize more Ukrainian territory under the pretext of maintaining peace in the region.
Clashes in eastern UkraineShow all 126 1 /126Clashes in eastern Ukraine Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukraine 'Azov' batallion soldiers capture pro-Russian activists after taking control over city of Mariupol in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Kiev Pro-Ukrainian supporters stand in front of the Russian embassy during a protest in Kiev
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Clashes in eastern Ukraine Ukraine crisis: Kiev Activists of Maidan self-defense and Right Sector ultra-nationalist organization attend a commemoration ceremony devoted for Ukrainian soldiers killed when a military cargo plane was shot down
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk An armed Ukrainian soldier looks around while guarding at a checkpoint not far of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk An Orthodox priest holds a service during a funeral ceremony in front of the local administration building in Kramatorsk for Viktor Gagulin, a Pro-Russian supporter, who was killed during an anti terrorist operation, Kramatorsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Awaiting of pro-Russian separatists is ongoing at the government building seized by Russian supporters in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Odessa A woman bearing flowers during the rally to mourn for victims of clashes in Odessa, outside Moscow's Kremlin
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Clashes in eastern Ukraine Ukraine crisis: Odessa Pro-Russian activists mourn during the funeral of Vyacheslav Markin, the deputy of the city regional council and leader of the pro-Russian opposition, who perished during a clash between pro-Russian and pro-Ukrainian activists
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian militants escort a blindfolded man outside the regional state building they seized
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian Cossacks eat a dinner outside the regional administration building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers stand guard at a Ukrainian checkpoint near the eastern town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk At least three people were killed and several were injured in clashes between Ukrainian forces and pro-Russian separatists in the eastern city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian military helicopter lands near a Ukrainian checkpoint near the town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian military helicopter lands at a checkpoint which troops seized in the early morning in the village of Andreevka, 7 kms from the centre of the southern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian soldier looks on at a Ukrainian checkpoint near the eastern town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Soldiers guard a checkpoint 25 kilometers from the city of Slavyansk. Militants in Slavyansk are keeping dozens of hostages, including seven European military observers, who were detained in the city while on a verification mission under the Organisation of Security and Cooperation in Europe (OSCE)
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A masked Ukrainian soldier takes position at a checkpoint which troops seized in the early morning in the village of Andreevka, 7 kms from the centre of the southern Ukrainian city of Slavyansk. Ukraine's military lost two helicopters and two servicemen in a deadly offensive launched just before dawn against pro-Russian rebels holding the flashpoint town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters try to destroy a Ukraine national flag outside the regional prosecutor's office in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian separatists seize the Prosecution Office in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers stand near a tank at a checkpoint near the south eastern Ukrainain city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers guard a roadblock along the highway near Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Armed pro-Russian militia attack the regional police building of Lugansk. Fresh violence erupted in eastern Ukraine after Moscow hit back at "Iron Curtain"-style Western sanctions
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Clashes in eastern Ukraine Ukraine crisis: Lugansk A resident walks through a barricaded area around the security services building. The pro-Russian activists have taken control of the state administration building and the police station
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Clashes in eastern Ukraine Ukraine crisis: Lugansk A pro-Russian activist stands guard outside the security services building. The area around the building has become a barricaded camp occupied by the pro-Russians
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk An armed pro-Russian activist stands guard at a checkpoint. Fresh violence has erupted in eastern Ukraine as thousands of pro-Russian protesters stormed key buildings
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Clashes in eastern Ukraine Ukraine crisis: Kiev Members of the protest group 'Self Defense of Maidan' stand on a barricade as they prepare to stop ultra-nationalist activists from marching through Independence Square in Kiev
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Clashes in eastern Ukraine Ukraine crisis: Kiev Pro-Ukrainian activists draw a giant map of Ukraine in front of the Parliament building, marking territories which could be lost as a result of the armed separatists' activity
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian activist gets medical attention after a clash with pro-government activists during a rally and march Donetsk. Several people were injured when the pro-Russian activists attacked a pro-government march
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists clash with pro-government supporters during a rally and march in Donetsk. Several people were injured when the pro-Russian activists attacked a pro-government march
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester walks in front of riot police during a pro-Ukraine rally in the eastern city of Donetsk. Several people were wounded when what appeared to be stun grenades exploded during a rally in support of Ukrainian unity in the eastern, separatist-held city
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Ukrainian supporters attending a rally in Donetsk. Around 1,000 people took part in a march for supporting of a Single Ukraine and were attacked by pro-Russian protesters
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Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russian armed man poses for a photograph with a child as he stands guard outside a regional administration building seized in the night by pro-Russian separatists
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Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russian armed man holds his weapon in front of the seized town administration building in Kostyantynivka Armed pro-Russian separatists who took control of the police headquarters in the east Ukrainian town of Kostyantynivka have also seized the town administration building
Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russia armed man aims his rifle in front of the seized city council building in Kostyantynivka
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian Ukrainian presidential candidate Oleg Tsarev (2-L) of the 'Party of Regions' party is accompanied by security personnel as he arrives to speak to journalists during a press briefing in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk A man reacts near a coffin containing the body of man killed in a gunfight, during a funeral ceremony in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Foreign military observers are escorted by pro-Russian militants to attend a press conference in city hall, of Slovyansk, eastern Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Slovyansk An armed pro-Russian protestor gestures as he stands guard on a checkpoint near Krasnyi Liman, in the Donetsk area
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A Ukrainian soldier smokes his cigarette in front of an armoured personnel carrier at a checkpoint in the village of Malinivka, east of Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russian activists walk past a anti-US and EU banner near the occupied Security Service building in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A Ukrainian security force officer is deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Ukrainian security force officers are deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian masked gunman seen during his duty on a street in the center of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian masked gunman patrols a street in the center of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters attend their rally near of a barricade in front of the occupied regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk An woman holds a Russian flag as she sits next to an elderly women inside a compound created by barricades which surround the Donetsk Regional Administration Building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Pro Russia militia carry a casket bearing Pavel Pavelko (42) one of three pro Russia militiamen killed in a shooting by unknown gunmen at a checkpoint, during his funeral procession in Alexandrovska village near Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Supporters of the Communist Party of Ukraine meet near the monument of former Soviet leader Vladimir Lenin in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk A masked man in military fatigues brings a blindfolded Irma Krat, arrested and held by pro-Russian protestors before her meeting with journalists near of occupied police station in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian activists are demanding broader autonomy from Kiev and closer ties to Russia and continue to occupy government, police and other administrative buildings in eastern Ukrainian cities, in defiance of an ultimatum by the Ukrainian government to lay down their weapons
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Russia, the United States, the European Union and Ukraine had agreed on steps to de-escalate the crisis in Ukraine during talks in Geneva, Switzerland
Clashes in eastern Ukraine Ukraine crisis: Luhansk Valeriy Bolotov (R) new people's governor of Luhansk, speaks to the media after he was pronounced the "people's governor" inside the Ukrainian regional office of the Security Service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk An orthodox priest sprinkles a holy water over a group of people during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Bodies of men killed in a gunfight are seen in coffins during a funeral ceremony in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk An activist shows ammunition near burned out vehicles in front of a pro-Russian blockade near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A masked man guards the entrance of the Security Service building occupied by pro-Russian activists during a rally in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Soviet army veteran Yuri stands outside a regional government building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Defiant Pro-Russian supporters react during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A tearful pro-Russian supportes during the singing of the Russian national hymn during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk A Soviet flag is seen on a barricade outside a regional government building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian armed men walk past activists hanging up a "Donetsk Republic" flag outside the mayor's office in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A man in military fatigues hugs a woman and a child during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Armed Pro-Russian man poses for a photo with local children next to barricades in front of city hall in Slovyansk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk The seperatist leader of the eastern Ukrainian city of Slavyansk, Vyacheslav Ponomaryov, holds up the pictures of two pro-Russia militants killed the day before in a gunbattle with unidentified attackers, as he holds a press conference in Slavyansk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukrainian Christian worshipers carry crosses as they march around the regional government building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Luhansk People rest under a tent next to barricades at the Ukrainian regional office of the Security Service in Luhansk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk A masked man holds a gun as as other armed people stand near tanks in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk An Orthodox icon is displayed on barricades in front of a city parliament in Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Men wearing military fatigues ride on an armoured personnel carrier (APC) in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Armed men wearing military fatigues gather by Armoured Personnel Carriers (APC) as they stand guard outside the regional state building seized by pro-Russian separatists in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Masked pro-Russian gunmen attack a photojournalist near combat vehicles flying a Russian flag, in downtown of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Men wearing military fatigues sit by a Russian flag and a white flag reading "People's volunteer corps of Donetsk" as they ride on an armoured personnel carrier (APC) in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk Ukrainian soldiers clash with pro-Russia protesters in a field near Kramatorsk, in eastern Ukraine
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk Ukrainian General Genady Krutov (C) talks to journalists in front of an Ukrainian airbase in Kramatorsk
Clashes in eastern Ukraine Ukraine crisis: Luhansk A woman wearing a national flower crown looks back as she attends a pro-Ukrainian rally in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Ukrainian soldiers stand guard near a military helicopter, near the Izyum city in Kharkiv area
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Pro-Russia activists throw stones as they storm the regional police building in the eastern Ukrainian city of Horlivka (Gorlovka), near Donetsk
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Pro-Russian men storm a police station in the eastern Ukrainian town of Horlivka
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Masked pro-Russian men attack British photojournalist Frederick Paxton during the mass storming of a police station in the eastern Ukrainian town of Horlivka
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Ukrainian police try to stop pro-Russia activists from storming the regional police building in the eastern Ukrainian city of Horlivka (Gorlovka), near Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian fighter guards a barricade bearing the Russian flag on the road leading to the eastern Ukrainian city of Slavyansk
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Clashes in eastern Ukraine Ukraine crisis: Slovyansk Armed pro-Russia protesters prepare for the battle with Ukrainian police special team on the outskirts the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russian activists escort a man (unseen) who they say is a provocateur outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russia supporters surround a man who they say is a provocateur (C) outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Armed pro-Russian supporters carry an Eastern Orthodox icon of Mary Magdalene outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Pro-Russian activists occupy the police station carrying riot shields as people watch on, in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk, near Slovyansk The interior minister overnight reported an attack on a police in the city of Kramatorsk, close to the city of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian gunman stands guard at a seized police station in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian gunman carries a mattress in a seized police station in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A pro-Russian supporter flashes the 'V'-sign during a rally in front of the security service building occupied by Pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian supporters clash with supporters of Single Ukraine in downtown Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Luhansk An effigy depicting Ukrainian politician and presidential candidate Yulia Tymoshenko is hanged on a advertisement board in front of the offices of the SBU state security service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk Pro-Russian protesters set a barbed wire on a barricade outside the SBU state security service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk A masked pro-Russian activist stands in front of barricades at the Ukrainian regional office of the Security Service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk Pro-Russian separatists reinforced barricades around the state security building in the eastern Ukrainian city of Luhansk and called on President Vladimir Putin for help after the government warned it could use force to restore order
Clashes in eastern Ukraine Ukraine crisis: Donetsk A Pro-Russian activist wears a hand-made mask behind a barricade in front of the regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters hold placards reading 'Freedom for detained heroes!' during a rally near the district court in Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Policemen leave their position from the regional administration building in eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters attend a rally near the district court in Kharkiv. Meanwhile, Russia rejected accusations that it was massing troops for an invasion of Ukraine and accused the West of making 'baseless' claims and waging an anti-Russian campaign
Clashes in eastern Ukraine Ukraine crisis: Kharkiv A view of the interior of the Kharkiv regional state administration chancery after being destroyed by pro-Russian protesters. Ukrainian policemen were injured as a result of an operation to free the administration building from pro-Russian separatists. Ukraine's acting president said on April 8 he would treat Russian separatists who have seized buildings in the east of the country as "terrorists" who will be prosecuted with the full force of the law
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters throw stones at an Interior Ministry bus near the regional administration building in Kharkiv. Ukrainian police cleared pro-Moscow protesters from a regional administration building in a lightning night-time operation, but others held out in two more eastern cities in what Kiev says is a Russian-led plan to dismember the country. Shots were fired, a grenade thrown and 70 people detained as officers ended the occupation in the city of Kharkiv during an 18 minute "anti-terrorism" action
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Armed men in masks, representing Ukrainian special forces, stand guard outside the regional administration building in Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters burn tires near of a regional administration building after police cleared it in Kharkiv. Protesters are demanding a referendum on the status of the Kharkiv region, similar to the recently held referendum in Crimea
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian activists hold red flags with the communist hammer and sickle and the soviet "USSR" initals during a rally at the regional administration building in the eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters (L) clash with activists (R) supporting the territorial integrity of Ukraine as Interior Ministry members (C) attempt to break them apart during rallies in the eastern city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters and police officers surround a group of around fifteen ultra-nationalist Right Sector group members (C) during a rally in Kharkiv. Several hundred pro-Russian protesters surrounded the group of ultra-nationalists and forced them to march down a steep hill on their knees in what appeared to be a humiliation ritual that drew no police response during the rally in eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester holds a placard bearing a crossed out "Nato" during a rally in the eastern Ukrainian city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters wave Russian flags during their rally in downtown Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists guard a barricade set at the Ukrainian regional Security Service building on the eastern city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukraine's embattled prime minister accused Russia of trying to "dismember" his country by plotting seizures of government buildings in eastern regions that are seeking to break away from Kiev
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists outside the Ukrainian regional Security Service building on the eastern city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Protesters are calling for former President Yanukovych to return to Ukraine and to hold a referendum on the status of the Donetsk and Lugansk regions, similar to the recently held referendum in Crimea
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters stand next to a barricade in front of the occupied regional administration building in Donetsk. According to reports, pro-Russian demonstrators stormed the administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Protesters set up a barricade inside an occupied regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russia protester sets on fire an effigy depicting Stepan Bandera, one of the founders of the Organization of Ukrainian Nationalists, during a rally in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian masked activist waves a Russian national flag in front of the regional administration building in Donetsk, where a large group of people surged into the provincial government building and smashed windows. A gathering of several hundred, many of them waving Russian flags, then listened to speeches delivered from a balcony emblazoned with a banner reading a "Donetsk Republic"
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists hold a huge Russian national flag in front of the regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists hold a rally in front of Ukraine's regional security service of Ukraine in Lugansk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian supporters clash with members of the riot police as they storm the regional administration building
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists evacuate a wounded following clashes with anti-riot forces after storming the Regional Security Service of Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters clash with police as they try to occupy a regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Around 100 pro-Russian protesters stormed the regional government building in the eastern Ukrainian city of Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk People clash with police at the regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters attend a rally in Odessa, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester waves a Russian flag behind policemen near the regional government building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian supporters clash with members of the riot police as they storm the regional administration building in the eastern Ukrainian city of Donetsk
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Meanwhile, Ukraine's interim Prime Minister Arseniy Yatsenyuk lashed out at the Kremlin accusing President Vladimir Putin of trying to "restore the Soviet Union" in an interview with NBC's Meet the Press on Sunday.
"President Putin has a dream to restore the Soviet Union," said Yatsenyuk. "And every day, he goes further and further. And God knows where is the final destination."
The Russian leader famously described the collapse of the USSR in 1991 as the "greatest geopolitical catastrophe" of the 20th century.
Today, Mr Yatsenyuk warned that restoring the Soviet Union would be the "biggest disaster of this century".
His comments come after a senior mediator with the Organisation for Security and Cooperation in Europe (OSCE) set off for eastern Ukraine to try to persuade pro-Russian groups to lay down their arms on Saturday.
Separatists have remained in the buildings in defiance to an agreement reached between the interim government in Ukraine, Russia, the United States and the European Union.
Washington has threatened further sanctions on Russia if it does not work to use its perceived influence over the separatists to get them to leave the buildings.
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