SEOUL, South Korea (AP) — North Korea launched multiple short-range ballistic missiles toward the sea on Sunday, its neighbors said, days after the U.N.’s nuclear watchdog warned that North Korea was making “very serious” advances in efforts to build nuclear weapons. The missiles fired from the North's Sinpo area flew about 140 kilometers (87 miles) each in a direction toward the country's eastern waters, South Korea's Joint Chiefs of Staff said. It said South Korea maintains a readiness to