cannabineer
Ursus marijanus
I would ask you for a reference to expert opinion on the bolded.I guess it's a matter of opinion, but an old-fashioned nuclear war of mutual annihilation seems unlikely. Don't get me wrong anybody using a nuke anywhere is a bad idea and it might have unfortunate consequences for those who use them. Best to let the dictators die off of natural causes and hope for better the next time, if you can.
Even if you found someone still holding to the old “limited nuclear war is doable” malarkey, all probability evaporates in the face of event.
There is no way to safely test the premise.
Should a nuke be used anywhere in the hot regions, many brass-heavy adrenal glands are gonna have a seizure. Cognitive degradation in the folks who can give the Order will result. I refer you back to Murphy thermodynamics.