Wearing army camouflage, flanked by two stone-faced lieutenants, and standing beneath a black flag showing a sword and an inscription in Arabic, the heavily bearded Umarov adds: "Through our actions we will awaken you.... we will make this a year of blood and tears."
Umarov styles himself "Emir Dokku Abu Usman" and proclaims himself leader of an Islamic "caliphate" that seeks to wrest from Moscow's rule virtually the entire northern slope of the Caucasus Mountains, including seven autonomous Russian republics strung out between the Caspian and Black seas.
He has taken responsibility for terrorist acts in the past, notably a twin suicide bombing in Moscow's crowded metro system last March that killed almost 40 people.
Umarov makes no mention of the Domodedovo attack, but experts say there may be a gruesome reason for that. They say the grim-faced young man standing on Umarov's left in the video is probably Magomed Yevloyev, a 20-something accounting student from the insurgency-wracked republic of Ingushetia, whom Russian authorities now believe was the suicide bomber who struck the international arrivals area of the airport on Jan. 24.
"In the video, Umarov is introducing this young man, who is going to be sent on a special mission, and there is growing evidence that was the bomber who hit Domodedovo," says Andrei Soldatov, editor of Agentura.ru, an online journal that follows security issues.