FILE - In this April 25, 2017, file-pool photo, U.S. special envoy for North Korea policy Joseph Yun speaks in Tokyo. Beyond the bluster, the Trump administration has been quietly engaged in back channel diplomacy with North Korea for several months, addressing Americans imprisoned in the communist country and deteriorating relations between the long-time foes, The Associated Press has learned. (Toru Yamanaka/Pool Photo via AP)
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