My real opinion on NK and the current situation is, yes something is going to go down. ROK, Japan and China don't want a psychopath thirty something year old with a nuclear weapon capable of going anywhere. Yes I get it, they figured out how to make a bomb, but the mode of delivery is really the ultimate concern.
What I personally see happening, heavy pressure from ROK, USA, China to basically blockade all commerce in or out. Backed with missile defense systems and preempt strike option. Objective here would be to obviously bring NK to its knees and get NK to disarm and stop all nuclear activities to include a possible leadership change.
I think the bullshit has gone as far as it's going to go, so they will either bring them to the table, or we will collectively smack them into shape. Do I think we will use nukes on NK? Not unless they use them first. But that doesn't mean we won't wipeout their deployment capabilities, their military capabilities and leave their government in shambles, via use of conventional weapons. I agree China being part of the coalition is key, and they would have a significant role in the execution of operations and rebuilding of NK. Hell a unified Koera under the ROK system would be beneficial to China, opening up better trade and sales of raw materials, etc.
Anyway, I've watched the back and forth since the 80's. I can honestly say that this is the first time Ive personally seen China show interest in a possible coalition approach, first time Japan has been ramping up their forces and the US has been extremely strong in its words and show of force.
My $.02