Hasn't it been obvious for a long time that good ol' Bernie is one of the boys when it comes to warmongering?

As for "Russia did it" the main argument against it that all the Russians had to do was turn off the gas at home. No need for an elaborate operation in the Baltic. The most probable guess is a continuation of the original quip about the purpose of NATO: keep America in, the Russians out, and Germany down. The last-named is still important because without German leadership, indeed, domination, in the military, political, and economic spheres, Europe will remain somebody's satellite / colony. Whose craw would that stick in? There's your perp.