Only two years ago the leaders of North and South Korea shared drinks, laughs and vows for peace during three highly orchestrated summits that lowered fears of war that had risen as Pyongyang pursued an arsenal of nuclear missiles. The North on Tuesday blew up an empty office building that had allowed the two Koreas to talk in person in the North Korean border town of Kaesong. Pyongyang also said it was scrapping a key military agreement aimed at reducing conventional threats along the border.
