Thanks!
NK is trying to neutralize U.S. military efforts. Troops are massing in March and April. NK wants SK to disrupt overall military planning of U.S..
It is nothing to celebrate about and actually a very serious problem. Because we have willing NK agents in S. Korea's ruling circle.
This time around, there is a potential that this would be a part of more sustained efforts. In addition to running interference against U.S., they will attempt to yank SK from alliance with U.S. and create sizable solid appeasement constituency in SK.