The entire US strategy on this is that despite all the rhetoric about Putin being a crazy dictator, they are confident that he is rational enough to avoid the use of nukes, or weak enough that he will be overthrown before he does. That’s insane and/or shows you that they know everything they are saying about him is a cynical lie.

Of course, there is also the possibility that they are intentionally trying to goad him into a nuclear response. In which case they are simply pure evil.