Isis may be preparing to invade Central Asia says Russian Intelligence chief

There are fears that fighters at country's northern border could look to mount an invasion

President Vladimir Putin called the extent of Isis' presence in Afghanistan 'close to critical' (Getty)

Russian intelligence has warned of an increased risk of Taliban or Isis fighters invading Central Asia.

FSB director Alexander Bortnikov said in comments carried by Russian news agencies on Wednesday that a concentration of Taliban fighters, some of whom had pledged allegiance to the Islamic State group, at Afghanistan's northern border make the risk of invasion tangible.

Afghanistan shares a porous border with the former Soviet republics of Turkmenistan, Uzbekistan and Tajikistan, which have long been a source of drugs infiltrating into Russia and is a longstanding worry of Moscow's.

Putin earlier this month called the situation in Afghanistan "close to critical" and called on other ex-Soviet nations to be prepared to act together to repel a possible attack.

AP