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I've long thought India vs Pakistan was the most likely place for a nuclear war.
But Putin vs NATO seems to have some potential,
and North Korea is crazy enough to even nuke China.
A few thoughts. North Korea is never going to nuke China. The simplest reason is they are allies. A very troubled and difficult alliance, but still an alliance, and China literally keeps North Korea afloat. Even if they had a rupture, it's just not feasible. The Norks have maybe half a dozen Nukes. They could concentrate on cities with populations of 10 million or more and still not hit all of them. Not to mention the 135 or so additional cities with populations over 1 million.
Don't mistake North Korea playing crazy and saying and doing crazy **** for being actually crazy. Their "crazy" is actually a form of terrorism, because it terrorizes the world into giving them free **** every time they start running out of food or heating oil and have to close down their universities to gather the harvest with actual freaking scythes.
India and Pakistan are of course dangerous, but they do have a sort of corollary of MAD going on: mutual assured non-destruction. Which means neither side really knows how strong the other side is and the only thing worse than having your country destroyed is finding out at the last minute that your enemy has 20 nukes more than you. India too has invested a nuclear triad including sub-launched ballistic missiles, which makes their survivability nearly assured. Pakistan, being the (slightly) more nuts country, doesn't want to mess with that.
One thing everyone forgets when we develop "doomsday" scenarios about nuclear weapons is that 100 percent of the world's nuclear weapons - even the shipborne ones - and 100 percent of the likely targets, are in the Northern Hemisphere. If there's a nuclear war, you want to be in Brazil or Argentina.