Personally, I think the NK capacity to wreak carnage into SK is over rated as they are terribly impoverished. I don’t think that all their artillery and short range missiles would work as advertised, never mind troop moral facing an onslaught of our modern missiles and bombs. So, I think that a surprise and massive air attack on the NK DMZ would greatly reduce the blow back. Such an attack could reasonably entail sneaking a couple subs into the area, timed with a pretend ‘normal’ training exercise with one of our carrier task forces along with sneaking an extra 1 or 2 guided missile cruisers there for a shitload of missiles. Bombers could arrive in Japan for refueling in the night, and approach NK radar range just minutes after the missiles are arriving. The exploding missiles would just barely be ebbing as the massive bombs started arriving. Obviously, the ICBM facilities would also have to be attacked at the same time. After that it gets harder w/o PRC support, never mind tolerance… If the US/west didn’t have PRC participation, I’d imagine it would be a messy couple months as we built up troop strength to shut down resistance. I would assume that the SK army would take the initial brunt of holding the DMZ and mobilizing to invade. Of course, with PRC cooperation and invasion, it might be harder to just hand NK over to SK. We, the US could always promise militarily leave the peninsula if Korea was allowed to unify. Of course, SK could also tell us that we are crazy, and publicly tell us to fuck off. And it would be harder as more countries were involved, as any one group leaking out the intent to invade would really thrash everyone’s responses. It would be hard to do it right without the PRC, Japan, and SK in the know…