i'm going to keep my analysis on north korea terse.
it is a stalemate. it has been for decades. and, it's unclear what the americans think they can gain by breaking it.
it's not even "if". it's "why?". at least there are reasons to get into a fight in syria. does trump want to cross the yalu?
in 2017, the reality is that the united states has no strategic objective in invading korea. it would be reckless and idiotic.
regardless, the old truth remains: you can't declare a war on the north without declaring a war on china. it doesn't matter how irritating the north gets; if they have to, it will be the chinese that take them out, so they can occupy the space directly.
the president is driven by the news cycle.