This is why there should be complete nuclear disarmament, incl. the U.S., Europe, Russia... Mutually assured destruction is only a deterrent when people don't have Rapture death wishes or strive for jihadist martyrdom. (Oh, I know not all Christians and Muslims are nuts. But it's the nuts who are running the countries ...)
So, what if anything can we do to stop this? I feel like the guy in Groundhog Day who keeps waking up to the same chain of events, unable to do anything abut it. Are we all really so helpless? "Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.
You say you don't get Science Fiction. Read A Canticle for Leibowitz. We have met the enemy, and it is us — Pogo