washington unite state russia agree continue diplomatic efforts resolve crisis north korea development nuclear missiles capable hit unite state emphasize neither accept pyongyang nuclear power u.s. state department say wednesday state department spokeswoman heather nauert say secretary state rex tillerson russian foreign minister sergei lavrov speak telephone tuesday washington unite nations announce sanction north korea recent days two discuss concern relate dprk destabilize nuclear program emphasize neither unite state russia accept dprk nuclear power nauert say statement use acronym north korea official name democratic people republic korea say side agree continue work toward diplomatic way achieve denuclearized korean peninsula tuesday russia reiterate offer mediate ease tensions washington pyongyang raise fear new conflict peninsula moscow say lavrov tell tillerson washington aggressive rhetoric beef military presence region heighten tension unacceptable russia repeatedly call talk resolve crisis say lavrov underscore need fast move negotiate process language sanction tillerson emphasize diplomacy administration president donald trump repeatedly warn options include military ones table regard north korea october trump say tillerson waste time try negotiate north korea month white house follow offer secretary state begin talk pre-conditions say negotiations could hold north korea improve behavior washington announce sanction two prominent officials behind north korea ballistic missile program tuesday late step global campaign aim force north korea abandon weapons program friday u.n. security council agree new sanction response north korea nov. 29 test missile pyongyang say put u.s. mainland within range nuclear weapons north korea declare u.n. step act war tantamount complete economic blockade tillerson lavrov agree continue north korea diplomacy u.s. state department