I wouldn't bet on it, out 4k+ that Russia has in their arsenal, only dozens are needed to trigger a MAD scenario.

Also they have been investing in the nuclear program as well, creating devices like Poseidon[0] which could theoretically make an entire US coast unliveable.

The only winning move in nuclear brinksmanship is not to play.

[0] https://en.wikipedia.org/wiki/Status-6_Oceanic_Multipurpose_...