To be fair the USSR started with mass death and slaughter. Then continued in with it for some time. Strictly speaking the government never collapsed. Oh sure they loosened their grip on former forcefully conquered vassal States. But the bourgeoisie of the party didn’t go anywhere. They simply gave up the pretense of sharing the means of production. And transition to outright owning them as proper bourgeoisie.

We shouldn’t fool ourselves though. Russia is actually still slowly collapsing as are many governments. Hundreds of thousands of Russia’s sons have been conscripted to fight for a fascist in their very own Vietnam. With a heavy death toll and no end in sight. As day by day the requirements for qualification to be conscripted are broadened. Putin literally just burning away a large chunk of their society. It’s happening, just quietly now that there 4th estate in the US and globally has been captured and stripped bare at the altar of capitalism. Doesn’t matter if it’s east or west. Journalist are regularly fired, disappeared, or just slaughtered for doing their jobs