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MAD is only a nuclear deterrent. Unless/until someone uses a nuclear weapon, WW3 would be a conventional war, like Ukraine. If Putin were to start invading NATO countries, the response from NATO would be conventional — nobody who isn’t insane and suicidal would choose to launch nukes, unless they genuinely believed that they are being nuked (which makes nuclear terrorism a real existential threat).
What MAD means is nuclear powers are unlikely to be physically invaded, especially in areas of known nuclear weapon installations — a nuclear power believing it is facing imminent defeat, or nuclear attack, is most likely to use them; dictators like Putin are sociopathic enough to take the entire species with them.
The terms of what’s considered “war crimes” have changed… pray that they don’t change any further!