This article claims the Russians did not catch him on the 6 month visit. Oh well. Clusterpuck everywhere.
>>>US, Russia missed chances to intercept Tamerlan Tsarnaev
But Russian security, inexplicably, also dropped the ball, apparently failing to pick up the elder Tsarnaev brother or even question him during a lengthy visit to Russia the next year. The Dagestani Interior Ministry, the main law enforcement body in the Caspian republic of Dagestan, where Tamerlan spent as much as seven months in 2012 visiting relatives, said in a statement Saturday that “the Tsarnaev brothers are not on our databases of those wanted.”<<<
He must be on federal list investigated by KGB. Local authorities aren’t trusted by Feds in this part of the world, he could have connections in Dagestani police.
He was not wanted in Dagestan. That does not mean he was not watched.