What is that I smell? Bulls##t, crap, Do-Do. The whole thing was a false flag and the Russians want no part of it.
The Tsarnevs were only in the USA because of their uncle who appears to have been involved in CIA efforts to materially support Chechen rebels back in the 90’s.
The Fed Gov keeps supporting Islamic terrorists when they attack Russia or it’s allies and they keep biting the hand that feeds.