South Korea's air force has staged a live-fire drill simulating the destruction of North Korea's leadership, hours after Pyongyang launched a missile over Japan. Just before 6 a.m. South Korea time Tuesday, North Korea fired an unidentified missile from near the capital Pyongyang, towards the northeast. It flew over the northern Japanese island of Hokkaido, making it the first North Korean projectile to successfully pass over Japanese territory since 1998. It subsequently broke up and fell into the Pacific Ocean. Just hours after the launch, South Korea's Presidential Office announced four F-15K jetfighters had dropped eight MK84 bombs on a simulated target at the Taebaek Pilsung Firing Range in the country's northeastern Gangwon province, about five hours drive from Seoul .