It is insane to predict what a lunatic will do. You must prepare for the most likely possibilities. In a sane world, Un would be in a loonie bin (or dangling from the end of a noose) and not running a pi$$ant country with nukes.
Well, how long will that numerically inferior People’s Liberation Army detachment hold back against the invasion of China be the North Korean army?
Kim Jong Un is a pretty ambitious lad, and the way to the United States with a land army with limited trans-oceanic transport capability, is to march up through China and the eastern part of the Russian Federation, to cross at the Bering Strait and invade Alaska.
Attacking the continental US through Alaska worked so well for the Japanese. They did not even take Hawaii and hold it.
Grabbed the heck out of the Philippines for a while, though.