What he is not doing now does not mean that he won't consider, or at least use nukes as a scare tactic, if only through propaganda and fear tactics. Desperate times call for desperate measures.
But, if he is that psychotic and desperate, and nukes are his endgame plan of attack then we are indeed at the end of times. Imagine being so self inflated, with really no one on your side, including your own people, never mind other countries. Pushing the button would be the ultimate, taking my football and going home move, and to f.uck with all of you while I'm at it. Lunatic move.