FILE - In this Saturday, April 15, 2017, file photo, a submarine-launched ballistic missile is displayed in Kim Il Sung Square 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. North Korea observers have long marveled at the ability of a small, impoverished, autocratic nation to go toe-to-toe with the world's superpowers. (AP Photo/Wong Maye-E, File)
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