Here is a site that a Russian friend sent me a link for which discusses the connection.
A word of caution: Wayne Madsen Report is pro Russian and I am cautious about what I accept as truth from them. However the details listed contain some information that I found interesting if true.
TSARNAEV BROTHERS TIED TO ANTI-RUSSIAN OPERATIONS ROUND THE WORLD.
It mentions: McCain, Boris Berezovsky, Albright, and Soros.
Very interesting info, if paranoid. I hate Soros as much as the next American, but linking him to Israel is a bit much.