A photo taken on May 10, 2016 shows North Korean leader Kim Jong-Un watching a military parade and mass rally on Kim Il-Sung square in Pyongyang. Nuclear-armed North Korea launched four ballistic missiles on March 6, 2017 in another challenge to President Donald Trump, with three landing provocatively close to America's ally Japan. Seoul and Washington began annual joint military exercises last week that always infuriate Pyongyang, with the North's military warning of "merciless nuclear counter-action". / AFP PHOTO / Ed Jones