A U.S. Air Force B-1B bomber flies over Osan Air Base in Pyeongtaek, South Korea, September 13, 2016. REUTERS/Kim Hong-Ji

A U.S. Air Force B-1B bomber flies over Osan Air Base in Pyeongtaek, South Korea, September 13, 2016. REUTERS/Kim Hong-Ji

A U.S. Air Force B-1B bomber flies over Osan Air Base in Pyeongtaek, South Korea, September 13, 2016. REUTERS/Kim Hong-Ji

September 21, 2016 5:04 AM (UTC+8)