PANMUNJOM, South Korea — The U.S. ambassador to the United Nations urged Russia and China on Tuesday to reverse course, and stop rewarding North Korea’s bad behavior and blocking U.N. scrutiny of the isolated country’s efforts to evade sanctions over its weapons programs. Ambassador Linda Thomas-Greenfield made the remarks during a visit to the Demilitarized Zone, a heavily fortified border between the two Koreas, which remain technically at war. Her trip to South Korea came after Russia... Read this story