If, and if is the key word, Trump got his way, and pulled back, then it could start another nuke arms development race.
I really don, t think Trump could get all his wishes past the rest of his party, who really don, t want him anyway.
They shot them selves in the foot, letting him buy his way in, no one really took him seriously, but if they dumped him 6 months ago, and he went independent, then that would have handed the election to the democrats, so the republicans are now paying for their mistake, and so will the rest of the world if he becomes potus. Which I dont think he will, but it is a real possibility.