The Pentagon says B-1B bombers from Guam and F-15 fighter escorts from Okinawa, Japan, have flown a mission in international airspace over the waters east of North Korea. The U.S. says it’s the farthest north of the Demilitarized Zone that divides the Korean Peninsula that any American fighter or bomber has flown this century. Defense Department spokesman Dana White says in a statement that the mission shows how seriously the U.S.