Ukraine being a neo-nazi regime doing ethnic cleansing in Donbas and planning to host NATO weapons that can strike within Russia are precisely in line with the problem of NATO expansion. Incredible that you're unable to understand how a single overarching problem can have multiple aspects to it. Hope that clarified things for you.

It's pretty hilarious how nearly everything you listed as if they're contradictory points actually come together rather comprehensively to support the thesis that Russia is having to fight a belligerent NATO. And the one item that doesn't fit wasn't ever claimed by Russia to be a reason for the conflict.

I seem to have lost track of why he’s invading.

I don't know what anyone can do for you to cure your confusion when you can't even connect the dots between the very things you are linking.