Re: "Of course you realize, this means war"
You're forgetting the bit where there are missile defence systems. Sure, Russia can launch stuff. It won't get through. They were losing the race by the end of the Cold War, and have built _nothing_ in that line since, while the West has kept upgrading the defences.
A Cold War ICBM won't get through. Every one of the MIRVs will be destroyed. Zero chance of a single one even getting lucky and getting through to target.