The fortunate thing is that Kim has become belligerent enough that he is quickly becoming a liability to his allies in China and Russia. This problem belongs mostly to South Korea, Russia and China. Those three countries most likely have good intelligence on Kim’s location much of the time. At this point it would seem that the solution with the most hope for success would be for China and/or Russia to collude with South Korea to take out Kim, his entire upper echelon and as much of their communications infrastructure as soon as they poke their heads out of their little mole holes.
Best case scenario for us would be a reunification but China and Russia would probably not be happy with that, so it seems more likely that a more easily controlled commie puppet will be installed.
The good news is this zit is about to pop. Hopefully the puss and goo won’t end up killing too many innocent people. But this thing has been allowed to fester for far too long, if somehow things go well for our side it might send a message to other rogue nations around the world.