U.S. Air Force B-1B bomber, center, and two South Korean fighter jets F-15K fly over the Seoul Airport where a site for the 2017 Seoul International Aerospace and Defense Exhibition is taking place in Seongnam, South Korea, Saturday, Oct. 21, 2017. U.S. naval commanders on Saturday reiterated Washington's "ironclad" commitment to defend South Korea against North Korean threats as an American nuclear-powered aircraft carrier visited a South Korean port following a joint naval drill. (Kim Do-hun/Yonhap via AP)
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