No. If Russia strike first, US retaliation won't cause losses more significant than Russia had already suffered during WWII.
Anyway, the price of victory will be significant for Russia, but definitely lesser than the price of defeat.
If Trump choose "radically escalate" Russia will radically escalate either. In the current circumstances it, likely, means counter-force strike against the US nuclear forces.
Hey, but why do you think that Russia won't retaliate to your small strikes? Of course, Russia will retaliate.
Bla-bla-bla. Read something about Russian military history, and you'll see that Russia is more inevitable than the USA.
No. Russia won't launch "one nuke". Russia will destroy 500 targets. And then US retaliation capabilities will be more than "limited". They will be "degraded to the acceptable level".
Not our problem if Trump can't survive. It's not about personalities. Anyway, any survived high-rank American general can sign unconditional surrender. Rules are simple:
1) F#ck off now - and the USA (but not necessarily NATO) continue their existence in the current borders.
2) Our counter-force strike and the price of peace will be Alaska and California (but the USA will be still more or less independent country).
3) If you retaliate and we start counter-value bombing - we'll demand your unconditional surrender.
4) If you don't surrender even during massive counter-value bombing campaign - you are extincted. We'll grieve (for we don't want to genocide Americans), but it's acceptable for us.