It’s just a messy situation no matter how it’s looked at....any attempt to control this is going to be messy...and may leave open ‘other actors’ to move if the worlds resources and military attentions are focused there....
One thing is for certain..Fat Boy has consolidated his base in his city where he’s fed and housed the elite population there.....and you likely know they have no concerns for their ‘country’ population.... Might just have to blow the city itself along with the bases and secure the nuclear sites.
I remember watching a panel of analysts a few years back - the question was asked about how long it would take Japan to field a nuke, (thinking the reply would be in years) - "oh, about 72 hours".
I was told back in the early 70’s, was that all it would take for Japan to go nuclear was a screwdriver.
( meaning the components were in place but not assembled )
A nuclear armed Japan would change the balance of power in china’s eyes. Bolden is correct there could be reunification provided the US pulls out of the peninsula with troops. Let the South take the brunt of the refugee problem, much like West Germany did when the wall fell with the East. Let China seal the border with the North and force the North to stand down and cooperate.
A reunified strong Korea would be an advantage to the Chinese in playing off against their old enemy the Japanese and would take away the albatross around their necks that is the North. If they don’t the Japanese and eventually South Korea will have to go nuclear to counter the North’s reckless behavior and Peking doesn’t want any part of that.