On 7 February 2011 , Umarov claimed responsibility in a video posted online for ordering a suicide bombing at Domodedovo International Airport , Russia 's busiest airport .
He warned that more attacks were to come on Russian soil because of perceived repressions of Chechnya by Prime Minister Putin .
On 7 February 2011 , Umarov claimed responsibility in a video posted online for ordering a suicide bombing at Domodedovo International Airport , Russian 's busiest airport .
He warned that more attacks were to come on Russian soil because of perceived repressions of Chechnya by Prime Minister Putin .