The suicide attack on the arrivals area of Domodedovo international airport on 24 January left 36 people dead and 180 injured.

In a video posted online, Mr Umarov said the attack was a response to "Russian crimes in the Caucasus".

Similar suicide attacks would continue, he added, speaking in Russian.

Mr Umarov is leader of the "Caucasus Emirate", an Islamist militant group spanning the North Caucasus, and is one of the few prominent Chechen rebels still active, having served as security minister in the Chechen separatist government from 1996-99.

He has also claimed the March 2010 suicide bombings on the Moscow Metro in which 39 people died, and is said to have ordered the November 2009 bombing of a train from Moscow to St Petersburg that left 26 dead.