Chechen rebel leader Doku Umarov claimed responsibility Monday for last month's deadly attack on Moscow's main international airport that left 36 people dead.
There has been no claim of responsibility yet for the devastating suicide bombing at Moscow's airport on Monday -- but analysts say it bears all the hallmarks of the "Caucasus Emirate" and its leader, Doku Umarov.
A change in tactics among Chechnya's militants is threatening to bring their nationalist fight to the heart of Russia's cities, terrorism analysts fear.
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