So, to the best of our knowledge (at the moment), it appears that the Tsarnaev brothers have a rather complicated ethnic/nationality history, including Chechnya, Kyrgyzstan, The Caucasus and Russia.
We don't know yet whether these guys are connected to any larger terrorist organization; it's possible that they conceived of this whole bloody mess completely on their own (although it'll be fascinating to find out where they got their arsenal--not the pressure cooker bombs, which are made of hardware/homegoods-store materials, but the other explosives, assault rifles and grenades that have been reported).
However, assuming that there DOES turn out to be some sort of larger, international terrorist organization angle at play here, it's a damned shame that we don't have Herman "9-9-9" Cain in the White House to thoughtfully assess the national security and international relations policy implications of this development.
BEHOLD his WISDOM on such matters:
(h/t to my friend Pam Leigh on FB for the inspiration)