FILE – In this April 15, 2017 file photo, DPRK leader Kim Jong Un waves during a military parade in Pyongyang, North Korea to celebrate the 105th birth anniversary of Kim Il Sung, the country’s late founder and grandfather of current ruler Kim Jong Un. South Korea’s military says North Korea is believed to have conducted its sixth nuclear test. South Korea’s Yonhap News agency reported Joint Chief of Staff’s announcement Sunday, Sept. 3, 2017, about an hour after an unusual seismic activity was detected in North Korea near the site it had conducted nuclear tests in the past.(AP Photo/Wong Maye-E, File)