Don't give the USSR a free pass because it faced 'capitalist aggression'. The USSR invaded Eastern Europe and explicitly annexed half of Poland while in a literal pact with the Nazis. It almost nuked China, and starved millions to death in Ukraine all of its own volition. All of that was in living memory at the time of its collapse - it was a monstrous zombie that deserved to have a stake driven through its heart.

I say that as someone who actually has a pretty balanced perspective on 'capitalist' aggression too which has historically been severe and also with many unforgivable atrocities. But the USSR was big and powerful enough that its hand was not forced in the atrocities that it enacted.