Socialism never promised to be able to survive an assault by a vastly superior military force, that’s not how that works. It doesn’t promise to spread global revolution either.

That’s literally the thing though, and perhaps where the USSR went wrong. There is no magic bullet that would make a small nation able to survive a large attack, asside from strong allies with a ton of bigger nations, and sadly being different, and a possible threat to the status quo, doesn’t help with that.

That’s like saying being a serial killer helps survival over being a law abiding citizen that cares about others. Proof when I put a law abiding citizen and a serial killer in a locked room… the law abiding citizen doesn’t live as long. Of course the reality is, being a serial killer is evolved as the exception rather than the rule in humans, because, with numbers not making enemies is a more succesful strategy than always making them.