Edit I’m not talking about hitting strategic targets (do those really require H-bombs anyway?). And thanks for clarifying that the lives of citizens in allied countries are worth so much more than Russian citizens.
Since it would be very hard, though, for nations to keep enough around for mutually assured destruction without anyone noticing (or so I think) I would think that disarmament is not an entirely crazy idea. I would even assume that an agreement by the US, Russia and China would be sufficient. (I’m not sure to what extent Pakistan and India can threaten the rest of the World and I really don’t think Israel and North Korea matter. I’m also pretty sure that France and the UK would follow the US because they would look pretty stupid if they wouldn’t.)
Also with the fact that most Western European countries are quite small and densely populated compared to the United States and the Soviet Union the carnage here would have been indescribable (although if you want a feeling for what a "best case" attack might have been like feel free to watch Threads).