Pro-dialogue U.S. envoy on N. Korea issues to retire

Joseph Yun, U.S. special representative for North Korea policy, seen in this undated file photo, will retire as of March 2, State Department officials say on Feb. 27, 2018. The move by Yun, who has advocated talks with North Korea, may reflect his frustration over the White House's perceived undercutting of the diplomatic efforts of the State Department, according to diplomatic sources. (Kyodo) ==Kyodo