Russia can’t feed a half billion people, and if he is to conquer western Europe by force, he’ll be Tsar of a wasteland by the time he makes it to the coast of La Rochelle, Bristol and Lisbon. Besides, France and England have their own nukes.
He’ll try to interfere in their elections like he does with ours, but I don’t see a land invasion.
That said, be REALLY sure you know what you’re getting into if you move here. The slow bureaucracy and the paperwork are crushing, and just don’t even contemplate it if you don’t speak the language of where you’re going. Consider how easy life would be in Dallas, Boston or Chicago if the ONLY language you know is French or German. Bring $5 million with you, and sure, the USA will be quick to grant you a green card, but what’s your quality of life if you can’t communicate with anyone?
It can be done, but there’s more involved than packing up and buying a one way ticket. And do NOT give up your US nationality. If things DO get hairy here, the USA can’t deny you entry if ever you want to come back, even for visits.