Last month Doku Umarov, a terrorist leader and the self-proclaimed emir of the north Caucasus, warned that war was coming to Russia's cities.

上个月，自封的北高加索地区埃米尔、叛军头子乌玛·洛夫警告说，俄罗斯的城市即将陷入战火。

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Chechen rebel leader Doku Umarov claimed responsibility for the Moscow bombings in the name of Islam.

VOA: special.2010.04.03

The most recent Chechen claim of responsibility was posted on the Internet on behalf of separatist leader Doku Umarov.

VOA: standard.2009.12.12

Meanwhile,Chechen Islamist rebel Doku Umarov, dressed in a military camouflage jacket in a wooded location,claimed credit for the Moscow subway bombings in an Internet video posted on Wednesday.

VOA: standard.2010.04.01

Its overall leader, Doku Umarov, is a veteran Chechen guerrilla who claimed responsibility for the 2011 bombing of Moscow's international airport.

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Its overall leader is Doku Umarov, a veteran Chechen guerrilla who claimed responsibility for the 2011 bombing of Moscow's international airport.

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Much of the insurgency aims to make Dagestan a part of a pan-North Caucasus Islamist state which rebels have dubbed the Caucasus Emirate and install putative rebel leader Doku Umarov as its emir.

WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized