probably worthwhile the world powers reminding themselves that policies of nuclear deterrence rely entirely on rational agents
>I call it the Madman Theory, Bob. I want the North Vietnamese to believe I've reached the point where I might do anything to stop the war. We'll just slip the word to them that, "for God's sake, you know Nixon is obsessed about communism. We can't restrain him when he's angry—and he has his hand on the nuclear button" and Ho Chi Minh himself will be in Paris in two days begging for peace.
Sure they will say some aggressive things from time to time, but it's entirely rational for them to remind everyone that they have these nukes and are willing to use them.
If they do try to launch a nuclear attack (or even a conventional one), they will forfeit the cushy setup they've created for themselves.