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RU Intel: Tsarnaev met with Chechen militants several times - Hot Air
Which means [to Russian Intelligence at least] Tsarnaev enjoyed high enough priority as a potential terrorist or criminal to track and monitor continuously [but curiously, not arrest or detain]. One might assume that US Intelligence and Law Enforcement would extended no less a priority, or even have requested the assistance and reporting of host nation intelligence. I am beginning to catch a whiff of a bi-lateral counter-terrorism operation.
Posted by: Besoeker 2013-04-24
http://www.rantburg.com/poparticle.php?ID=366806