Worse than a crime - a blunder.
In the PR of the Russian government, America and West Europe were responsible for screwing their economy when Yeltsin took Keynesian economic advice. Many Russians don’t see us as friends, and wouldn’t be so offended if Americans are outraged at them.
I think the Russians only move is to blame it on the local separatists, find some unsavory mid-level commander to hang the rap on and shoot him in front of the cameras.
Putin can be patient when he needs to be. If he has to put off his encroaching annexation of the Ukraine until the heat dies down he can, because he knows it will. Even a horrible crime like this will only stay in the public consciousness until something else washes it away.
Nobody has the gonads to do anything that would seriously endanger the status quo — certainly not Obama.