The United States and Russia have agreed to continue diplomatic efforts to resolve the crisis over North Korea’s development of nuclear missiles capable of hitting the United States and emphasized that neither accept Pyongyang as a nuclear power, Reuters reported on Wednesday. The agreement came after the U. Treasury Department issued sanctions against two officials it describes as “key leaders of North Korea’s unlawful weapons programs.” American reconnaissance satellites have reportedly spotted Chinese ships suspected of selling oil to North Korean vessels about 30 times since October, despite sanctions.