Gee.  I thought this was "years" away.
True? Fake News? Pretext? Posturing?
I don't think we, as the American public, can assume this information can be taken as anything more than genuine and accurate.  At least in the way we, as a citizenry respond.
China, Russia and NK have set Trump up so that a negotiated solution will mean diminution of US presence on the Korean penninsula, and therefore diminished influence in East Asia.
Trump's "big body" bully stance is being openly mocked.  So, the "bully" is being called out to actually fight.
The problem is, we know how that sort of thing ends.  Particularly when the bully is universally unpopular.
Congress needs to act.  The reins of US international policy have to be taken from Trump.
He's going to start WW3 out of pure, unadulterated, ignorance based bluster.