In this June 13, 2017, file photo, Joint Chiefs Chairman Gen. Joseph Dunford prepares to testify on Capitol Hill in Washington. Dunford said Monday, June 19, 2017, that Washington and Moscow are in delicate discussions to tamp down tensions arising from the U.S. shootdown of a Syrian fighter jet, which the Russians called a violation of a U.S.-Russian understanding on avoiding air incidents. (AP Photo/Jacquelyn Martin, File)
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