>Contained conflagration, short targeted exchanges, probability of contamination low, material possibility of nuclear escalation.
That's describing something that's not a world war, though. The Russian invasion of Ukraine is already far worse than what you're describing as WW3. (setting aside nuclear escalation)
That's describing something that's not a world war, though. The Russian invasion of Ukraine is already far worse than what you're describing as WW3. (setting aside nuclear escalation)