North Korea fired an unidentified ballistic missile into the sea off its east coast, South Korea’s military said on Friday, the latest in a series of launches by the nuclear-armed country. A statement from South Korea’s Joint Chiefs of Staff (JCS) gave no further details. The latest launch was announced shortly after the military said South Korea scrambled fighter jets when a group of about 10 North Korean military aircraft flew close to the border dividing the two countries, amid heightened tensions over repeated North Korean missile tests. A subsequent statement on North Korea’s official KCN…