GWANGJU : A U.S. F-22 Raptor stealth fighter jet lands as South Korea and the United States conduct the Max Thunder joint military exercise at an air base in Gwangju, South Korea, Wednesday, May 16, 2018. North Korea on Wednesday canceled a high-level meeting with South Korea and threatened to scrap a historic summit next month between President Donald Trump and North Korean leader Kim Jong Un over military exercises between Seoul and Washington that Pyongyang has long claimed are invasion rehearsals. (AP/PTI)