SEOUL, Oct 5 (Reuters) - South Korea and the U.S. military conducted rare missile drills and an American supercarrier repositioned east of North Korea after Pyongyang flew a missile over Japan, one of the allies' sharpest responses since 2017 to a North Korean weapon test. Nuclear-armed North Korea test-fired an intermediate-range ballistic missile (IRBM) farther than ever before on Tuesday, sending it soaring over Japan for the first time in five years and prompting a warning for residents there to take cover. The White House National Security Council called North Korea's latest test "dangerous and reckless" and the U.S. military...