Nicholas Burns (file photo)

A top U.S. official says Iran will face consequences for its refusal to suspend uranium enrichment.

Under Secretary of State for Political Affairs Nicholas Burns told VOA (Persian Service) that Iran is isolating itself through its nuclear activities.

Burns said Iran will face sanctions from not only the United States, but other countries as well.

Iranian President Mahmoud Ahmadinejad Friday dismissed a previous warning from U.S. Secretary of State Condoleezza Rice that Iran could face strong action by the U.N. Security Council over its nuclear program

Condoleezza Rice

Rice said earlier in the week that Iran's claims of an advance in uranium enrichment will require strong steps by the U.N. Security Council when it meets on the issue at the end of the month.

Ahmadinejad dismissed her comment as unimportant.

Officials from the United States, China, the European Union and Russia are to hold talks in Moscow Tuesday to discuss Iran's nuclear program.

Late month, the U.N. Security Council gave Iran 30 days to suspend uranium enrichment. The IAEA is expected to report to the Security Council on Iran's compliance with the Nuclear Non-Proliferation Treaty by April 28.

The United States accuses Iran of seeking nuclear weapons - a charge Tehran denies.

Some information for this report was provided by AP.