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He invaded Ukraine because Ukraine has shared history, culture and influence that he'd prefer to keep for Russia as you've just proven.Your asking why would he. He is pissed that the USSR broke up and wants to reestablish it. What would be your suggestion if he went for one of the minor NATO countries on his doorstep?
That isn't going to extend further, there's no reason for him to invade a country like Poland because why? It could happen with Estonia or the other ex-USSR states for the reasons you've given but they're all NATO countries so he can't do it?
Attacking any of them would result in a NATO response whether that's conventional defence, nuclear war or who knows but either way his attack would be obliterated.
The only scenario I can see where he invades a western country is one where he goes rogue but then we and him are all screwed. Given that fact then why would he bother to invade? Why wouldn't he just nuke us first?