 In response North Korean leader Kim Jong-un called the speech "unprecedented rude nonsense" and "mentally deranged behaviour".On September 23, 2017, the U.S. Military flew B-1B bombers from Guam, along with F-15C Eagle fighter escorts from Okinawa, Japan flew in international airspace over waters east of North Korea.Unlike on previous missions, the U.S. aircraft were not accompanied by South Korean or Japanese planes.