washington unite nations envoy jeffrey feltman former high-level u.s. state department official carry message u.s. government visit north korea talk behalf world body state department say tuesday feltman currently u.n. undersecretary-general political affairs previously serve u.s. assistant secretary state near eastern affairs certainly aware travel auspices role unite nations north korea state department spokeswoman heather nauert tell reporters travel behalf u.s. government travel -i want make clear kind message u.s. government u.n. envoy carry u.s. government message north korea visit u.s. official