The United States has warned North Korea that its threat to resume missile testing would further isolate the regime from the international community.
A senior White House official issued the warning Saturday after North Korea threatened to end its self-imposed moratorium on missile testing.
North Korea's ambassador to China blamed what he called the "hostile policies" of the United States for Pyongyang's decision.
Pyongyang froze missile tests in 1999, a year after test-firing a medium-range missile that flew over Japanese territory, raising regional tensions.
In Moscow, Russian Foreign Minister Igor Ivanov called for dialogue to end escalating tensions over North Korea's nuclear and missile programs.
The foreign ministry says Mr. Ivanov has been telephoning his counterparts in France, China, South Korea and the United States to advance a dialogue to achieve an overall solution.
Mr. Ivanov also says it is too early for the United States to take its case against North Korea to the U-N Security Council.
U-S officials said they would pursue a U-N solution after North Korea said it was withdrawing from the Nuclear Non-Proliferation Treaty.