Appeasers/cowards like you (haven't fully decided in your case) love to play up the threat of nuclear war. Problem is, Putin's cronies among the Russian elite aren't wild-eyed ideological zealots who are perfectly willing to cast their enormous and ill-gotten wealth, a lot of it outside Russia, into the fire of a nuclear conflagration.
Putin has of course made mouth-noises about having nukes, but it's bluster. So, scratch that alarmist nonsense.
How exactly is the damage going to be so severe for Russia that future aggression would take a generation to manifest? Russia ain't the one being invaded. Your claim makes no sense.