> And now we are at a situation where nuclear escalation has already started (New START was not extended).

This is a massive understatement. Russia has announced, and probably tested, https://en.wikipedia.org/wiki/9M730_Burevestnik . This is basically Project Pluto reloaded, but now as a Russian instead of a US missile.

I remember reading about Project Pluto some 25 years ago or so. It was terrifying to read about. And now Russia has realized it.