In this photo taken on July 27, 2013, Korean People's Army (KPA) soldiers carrying packs marked with a radioactive symbol take part in a military parade in Pyongyang. North Korea appeared to carry out a sixth nuclear test on September 3, 2017, possibly of a hydrogen bomb more powerful than any device it has previously detonated, presenting President Donald Trump with an unprecedented challenge. / AFP PHOTO / Ed Jones (Photo credit should read ED JONES/AFP/Getty Images)
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