"We will not have the meeting today in Vienna," Ali Ashgar Soltanieh, the chief Iranian envoy to the International Atomic Energy Agency told The Associated Press. "Both sides are arranging for a couple of days later."
The talks had been tentatively set for Wednesday in Vienna as a final attempt to see if there was common ground to start negotiations between Iran and the six nations that have been trying to persuade Iran to curtail its nuclear program.
But while the European Union's Javier Solana had been ready to fly to the Austrian capital at short notice, the talks had been left hanging by uncertainty over whether Iranian nuclear envoy Ali Larijani would come.
There was no immediate comment from Solana's office in Brussels. Although Soltanieh said the decision to postpone any meeting had been mutual, it appeared that Iranian reluctance to attend had scuttled the chance of Wednesday talks.
Soltanieh said "a procedural matter" had led to the postponement, but offered no details. In Tehran, Foreign Minister Manoucher Mottaki said only the time and place of any meeting was still "under discussion by both sides."
Iran defied an Aug. 31 deadline by the U.N. Security Council to freeze uranium enrichment. Still, the five permanent council members and Germany — the six powers attempting to entice Iran into negotiating on its nuclear program — had decided to hold off work on imposing sanctions until the outcome of any talks between Solana and Larijani. Senior negotiators of those six countries were to meet in Berlin on Thursday to plan their further Iran strategy.
Iran's unyielding stance appears to be based on the calculation that sanctions will be opposed by Russia and China, both veto-wielding Security Council members that have major commercial ties with Iran. The United States and key European allies Britain and France had agreed to wait for the result of talks between Solana and Larijani in an attempt to mollify both Moscow and Beijing.
In Moscow on Tuesday, a top Kremlin aide said Russia remained reluctant to impose sanctions on Iran, although this did not imply support for a nuclear-armed Iran. "We could suffer more than anyone else if they built nuclear weapons," said Igor Shuvalov, a senior aide to President Vladimir Putin.
But he cautioned that introduction of economic sanctions could further increase global oil prices and have a negative impact on regional stability. He added that Russia's location next to Iran and former Soviet Muslim republics in Central Asia made it particularly vulnerable. "We don't mind using a stick, but we don't want that stick to hit us or our partners over the head," he said.
China's premier Wen Jiabao echoed Shuvalov's sentiments, saying the six powers had to be cautious about moving toward sanctions because they may prove counterproductive.
But U.S. officials on both sides of the Atlantic suggested the time had already come for punitive Security Council action. State Department spokesman Sean McCormack said in Washington the Security Council had made clear in a resolution that it was prepared to vote for sanctions if Iran failed to meet the Aug. 31 deadline to suspend enrichment.
McCormack said Tuesday the United States intended to proceed "down that pathway." Echoing those comments, Gregory L. Schulte, chief U.S. delegate to the IAEA, accused Iran's leaders of making "a strategic decision to acquire nuclear weapons." "The time has come for the Security Council to back international diplomacy with international sanctions," he added.
Iran insists it has a right to enrich uranium for generation of nuclear power. But suspicions are growing it wants to develop the technology to enrich uranium to the weapons-grade level for the fissile core of nuclear warheads.
In a further sign that Iran is ready to defy the international community, its parliament took the first step Tuesday toward blocking international inspection of the country's nuclear facilities in case of U.N. sanctions. The measure would need approval by other bodies before it could take effect.