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In this September 18, 2017, file photo provided by South Korea Defense Ministry, U.S. Air Force B-1B bombers, F-35B stealth fighter jets and South Korean F-15K fighter jets fly over the Korean Peninsula during joint drills. Ahead of the second summit between U.S. President Donald Trump and North Korean leader Kim Jong Un, some observers say there is an uncertainty over the future of the decades-long military alliance between Washington and Seoul. (Photo by South Korea Defense Ministry via AP Photo)
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