President Bush said Thursday that the standoff over Iran's suspected nuclear program is headed for the U.N. Security Council if Tehran continues with uranium enrichment.

"We'll see whether or not that is the firm position of their government," Bush said after a meeting with his Cabinet at the White House. "If they continue their obstinance, if they continue to say to the world `We really don't care what your opinion is,' then the world is going to act in concert."

With Russian and Chinese support crucial to crafting a deal for Iran that also includes a threat of sanctions, Bush said that he "got a positive response" from Russian President Vladimir Putin during a conversation on Tuesday.

"We expect Russia to participate in the United Nations Security Council," Bush said he told Putin. "We'll see whether or not they agree to do that."

Countrywatch: Iran

He was less positive about his discussion of Iran earlier Thursday with Chinese President Hu Jintao.

"They understood our strategy," Bush said. "The most positive thing about all the conversations I had is there's uniform agreement that the Iranians should not have a nuclear weapon. And we'll discuss tactics and strategies to make sure the international community speaks with one clear voice."

Secretary of State Condoleezza Rice said that the United States and international partners are close to a deal that would offer Iran economic incentives if it gives up nuclear activities that could produce a bomb. Rice was meeting in Vienna with foreign ministers from the European nations that led stalled talks with Iran last year and would help present any new deal, and also with representatives of Russia and China.

The meetings come a day after the United States' surprise announcement that it is now willing to join the direct European talks with Iran, though only if Tehran suspends suspect activities and returns to the table. The shift in U.S. tactics was meant to offer the Iranians a last chance to avoid punishing sanctions.

Iran's foreign minister welcomed the idea of direct talks, but rebuffed the U.S. condition that Tehran first must suspend uranium enrichment.

"Iran welcomes dialogue under just conditions but won't give up our rights," the state-run Iranian television quoted Foreign Minister Manouchehr Mottaki as saying Thursday.

Bush said "the choice is up to the Iranians."

"They've already said, by the way, that they're willing to suspend," he said. "This gives them a second chance to make sure their words mean something."

The package outlined Wednesday by Rice would be on the table for any new talks including the United States. Previous talks among Iran, Britain, France and Germany foundered last year. Iran insists its nuclear work is peaceful and aimed at developing a new energy source.