You're right Cactus Flower.
Trump needed to change the subject(s).
Poor Rex Tillerson was the last to hear, caught blindsided while traveling.
Trump doesn't do the footwork to know how to deal with this, he likes the headlines & compliments.
'We' don't even have an ambassador of South Korea, nor people in place to advance 'talks' with care. Not that Trump would listen to them...
Why would Kim denuclearize? he knows what happened to Gaddafi & Saddam after they did.