Well, the USSR was called out for the various wars with Finland and Poland, up to the point the Western Allies promised help before retreating to "my enemies enemy..." with Stalin. SO when exactly did the USSR start an invasion without being called out? And don't count invasions during WW2 against the Axis, those don't count once a war started.
I mean Germany was found guilty during the Nuremberg trials in part for its invasion of Poland - the one where the USSR secretly agreed to it and murder thousands of Polish Officers.
Yet the USSR was not one of the defendants at the trial but rather one of the judges.
At the time so, USSR was called out for it, the Allies were not that hot on the Molotov-Ribbentrop pact, were they? Lucky for them they ended up on the right side (and winning side) of history.
