EXPLOSIVE DEVELOPMENTS: Washington awoke this morning to the news that North Korea carried out a threat made by Kim Jong Un’s sister to “completely collapse” the “useless North-South joint liaison office” on the North side of the border.

Kim Yo Jong, Kim’s younger sister, made the threat over the weekend as North Korea cut off communication with the South over the practice of defectors from the North sending pro-democracy leaflets via balloons across the Demilitarized Zone that separates the two Koreas.