Although terrorists from the Caucasus have struck in Moscow and other parts of Russia, the conflict in the region has never led to attacks in other countries. One possible explanation for the Boston bombings, said Aslan Doukaev, an expert on the Caucasus who works for Radio Liberty in Prague, is that the brothers were motivated by radical jihadism, not Chechen separatism.
As the war in Chechnya wound down after Russian forces withdrew ”” they left formally in 2009 ”” violence has spilled into neighboring republics such as Dagestan, where the Tsarnaev family once found shelter and where the brothers’ parents now live. That conflict is increasingly marked by radical Islamic terrorism in an often vicious cycle of attack and reprisal between insurgents and Russian security forces. Tamerlan visited Dagestan last year, according to an official with knowledge of his travels.