Russia seems likely to cooperate with US authorities on the Tsarnaev investigation, some regional experts say, especially because the threat of Islamist extremism and terrorism is a concern the Russians have long emphasized in their dealings with the US and on a variety of issues – from human rights abuses to the war in Syria. Russian President Vladimir Putin sent President Obama his condolences over the Boston bombings even before the Tsarnaev brothers emerged as suspects.
Still, some analysts wonder if a recent row between the two countries over human rights abuses and what Russia interpreted as US interference in Russia’s domestic affairs suggest that lingering suspicions could hamper cooperation on the bombing case.
The FBI declined to discuss any plans to investigate with Russian authorities Tamerlan’s 2012 trip to Russia or other places he visited. But one US official noted that the FBI has a legal attaché in Moscow and one in Kiev, Ukraine, and that one could “safely assume” the investigation is already under way.
The younger Tsarnaev, Dzhokhar, was formally charged Monday with use of a "weapon of mass destruction," specifically an improvised explosive device, resulting in death.