I would normally consider this whole situation nothing more than sabre-rattling by both sides.

But given Trump's military background and his respect for military people, as well as the many war-mongers in Congress and the Pentagon, along with NK's recent nuke tests and missile launches, this whole situation could rapidly evolve into a real conflict.

Maybe Trump's just trying to look tough on the international stage and has no intention of starting anything, but how can anyone make even an educated guess as to what going in that head of his?