So, how long does he think North Korea can sustain a war? It that army in tip top shape? Can they mount any kind of broad offensive? Would they rain a gas attack on Seoul? The little toad is about to kick off, are his successors more reasonable? How about a decapitation strike?
For a couple of hours. But that's enough time to fire every shell they have, and launch every missile, and use up all their nuclear warheads (that they may or may not have.) SK will be history, and it doesn't matter that the USA will destroy NK just about the same time.
SK is facing an irrational foe, not far from a madman. They have to be very careful.