[Mawr]

Game theory would like to have a word. If I'm Putin and I know you will not defend your country if threatened, what's to stop me from annexing it? And then the whole world? After all, we don't want people to die in wars. It's much better for them to die in concentration camps.

[johnisgood]

There are a LOT of things preventing Putin from doing what he SUPPOSEDLY wants, but regardless, you are not Putin, you do not know what he wants or would do. Putin cannot simply just invade countries at whim, assuming he wants to do that.