There will be no massive nuclear attack of any kind. War is just an extension to politics, it has its goals. Everyone around Putin knows about MAD and have their own families, no one will sacrifice them to altar of Putin, he will be removed before anything like that happens. Your fear is exactly what he wants, this is his goal, to paralyze the west in fear so he can take country by country in upcoming years. The only language he understands is force and strength, he will take how much you will give him until you say no more.