FILE - In this April 15, 2017, file photo, a submarine-launched "Pukguksong" missile are displayed in Kim Il Sung Square in Pyongyang, North Korea. The message of the parade is clear: North Korea is, or is near to being, able to launch a pre-emptive strike against a regional target. It is preparing to withstand a retaliatory follow-up attack if it does, and it is building the arsenal it needs to then launch a second wave of strikes, this time at the U.S. mainland. (AP Photo/Wong Maye-E, File)
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