The show of cooperation and force by both the United States and China, and China's cancellation of a coal order is most likely meant to start internal assassination attempts on Kim Jong-Un.
North Korea has good numbers of military personnel, but not as many as China
North Korea has some advanced weaponry, but nothing compared to the United States.
Any North Korean general with half a brain will figure it out that they don't have a chance.
As far as we know, we may already have a high level North Korean insider working on this now. The show of force is only helping the insider to gather a coalition to oust his royal fatness.