RTRS - GENEVA - NORTH KOREA DIPLOMAT TELLS U.N. DISARMAMENT BODY THAT "MASSIVE, RTRS - GENEVA - NORTH KOREA DIPLOMAT TELLS U.N. DISARMAMENT BODY THAT "MASSIVE, UNPRECEDENTED" U.S.-SOUTH KOREA JOINT MILITARY EXERCISE IS "MAJOR CAUSE OF ESCALATION OF TENSION THAT MIGHT TURN INTO ACTUAL WAR"