U.S. Assistant Secretary of State Christopher Hill is to leave for Asia on Thursday to meet with allies and discuss North Korea's missile tests.
Hill has urged Pyongyang to return to the six-party talks, which are aimed at resolving the North Korean nuclear crisis.
At the White House Wednesday, President Bush condemned the missile launches and said North Korea has further isolated itself from the rest of the world. European and Asian leaders have also condemned the North Korean action.
In an interview with Russian television Wednesday, a Kremlin aide said the leaders of the world's industrialized nations will discuss the missile testing at this month's G-8 summit.
U-S Ambassador to the United Nations, John Bolton said Security Council members are united in wanting to send a strong message to North Korea.
Japan, meanwhile, has circulated a draft resolution that calls for a ban on the transfer of funds, material or technology that could be used in North Korea's missile program. Japan is within missile range and has raised its military alert status.
North Korea fired seven missiles, including a long-range rocket that experts say is capable of reaching the United States. The U.S. Department of Defense says it detected all seven missiles and quickly determined they posed no threat to the United States.
U.S. officials say the one long-range missile failed less than one minute after launch. They said it fell into the Sea of Japan.
North Korea's Foreign Ministry has described the missile tests as a matter of national sovereignty.