Tehran insists its nuclear program is for peaceful purposes only. But it refuses foreign offers of reactor fuel if it stops making its own through uranium enrichment a process that worries the international community because it could be used to arm nuclear warheads too.
Concerns also focus on IAEA suspicions that Iran has worked secretly on nuclear arms allegations Iran dismisses as based on fabricated U.S. and Israeli intelligence.
With fears growing over the possibility of Israeli military attack and other diplomatic efforts on Iran deadlocked, diplomats told The Associated Press that a resolution supported by the six powers seeking to engage Tehran on its nuclear program had become a priority discussed at the highest level.
The text was agreed on only after consultations involving U.S. Secretary of State Hillary Clinton and her counterparts in Russia, China, Britain, France and Germany, said the diplomats, who demanded anonymity because the negotiating process was confidential.
While the four Western powers had no differences, it was unclear until Wednesday whether Russia and China which Iran has relied on to blunt harsh U.N. and other sanctions would agree to join in backing the resolution. The diplomats said that they were persuaded largely with the argument that a signal of big-power unity had to be sent to Israel.
A Russian diplomat refused on Wednesday to discuss how the accord about the resolution came about. Russia and China have been inconsistent in backing such Western efforts in the past. While joining in a critical resolution at an IAEA meeting in November, they refused to do so in June.
The current unity came at a price for the West, however, which had to settle for compromise language in the text of the resolution, made available to The AP outside the closed meeting.
While expressing "serious concern" over continued Iranian uranium enrichment in defiance of the U.N. Security Council, the six nations say they back the "inalienable right" of countries that have signed the Nuclear Nonproliferation Treaty to develop nuclear energy for peaceful purposes. That is a bow to arguments by Iran, an NPT signatory, that it has a right to enrich uranium.
The resolution "stresses" that the IAEA has not reported any nuclear material missing from Iran sites it is monitoring. Missing material could mean that Tehran is using it elsewhere for weapons purposes.
It only "notes" that the agency cannot conclude there is no hidden nuclear activity going on because of "lack of cooperation" by Iran on agency requests that it be given greater powers to monitor the country.
In Berlin, German Foreign Minister Guido Westerwelle said there was still time for a diplomatic solution to the Iran tensions, but "everyone must know that a nuclear armament of Iran is not acceptable.
"It is not acceptable for Israel, not acceptable for the region, and it is not acceptable for the stability of the world's security architecture."
Washington considers any signal to Israel that diplomacy is working is crucial amid signs of increased jitters by the Jewish state about Tehran's nuclear progress.
Most recently, Israel Prime Minister Benjamin Netanyahu criticized what he said was the world's failure to spell out what would provoke a U.S.-led military strike against Iranian nuclear facilities. The comments came in response to U.S. refusals in recent days to set "red lines" for Tehran.
"The world tells Israel, 'Wait. There's still time,'" Netanyahu said Tuesday. "And I say: 'Wait for what? Wait until when?' Those in the international community who refuse to put red lines before Iran don't have a moral right to place a red light before Israel."
Also Tuesday, diplomats told The Associated Press that the U.N. atomic agency has received new and significant intelligence over the past month that Iran has advanced its work on calculating the destructive power of an atomic warhead through a series of computer models within the past three years.
The diplomats said the information came from Israel, the United States and at least two other Western countries. They demanded anonymity because they were not authorized to discuss classified information member countries make available to the IAEA.