Not likely to happen that way.
The most likely scenario for a thermonuclear war is between one or two smaller states with long running hatred and religious fanatical governments. The big players are likely to stay out of it. It will be far from a global event, and won't even fully destroy the states involved.
Lets say Pakistan and India have a go, or Iran and Israel: I don't see any other state too interested to jump into that mix on any of the sides. The participants get stung hard, exhaust their arsenals and beg for humanitarian aid.
Contrary to popular belief a few tens of warheads going off is not going to affect life on earth that much from a biological stand point.
Not a bad analysis to prevent that we likely need something like the great convention. "You drop one nuke and everybody else in the world gang up on you!"
Thou shalt not make a machine in the likeness of a man's mind.
Don't worry. We should not expect that our future robot helpers will immediately be perfect, i.e. better than us at the things that we do best, but at least they will not be burdened with our many weaknesses, including dogmatic behavior stemming from an irrational belief in the supernatural.
loll Damn peoples only remember the "Fear is the mind-killer." line from Dune!
If a 6600 used paper tape instead of core memory, it would use up tape at about 30 miles/second. -- Grishman, Assembly Language Programming