Anticipation of any brief but historic encounter between President Hasan Rouhani and Obama during the global meeting yesterday faded as US senior officials said a meeting proved to be too complicated for the Iranians.
The officials insisted on anonymity because they were not authorised to discuss the decision publicly. It would have been the first encounter between US and Iranian leaders in 36 years.
Iranian leaders have avoided past ceremonies because of the presence of alcohol, which is forbidden under Islamic law.
Rouhani was addressing the General Assembly later yesterday afternoon. Obama spoke in the morning, and while Rouhani was not seen there, Foreign Minister Javad Zarif was in attendance.
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Obama welcomed the new Iranian government's pursuit of a "more moderate course," saying it should offer the basis for a breakthrough in nuclear talks.
Hollande, speaking before his meeting with Rouhani, said he was open to dialogue with the recently elected leader, which he promised would be frank and direct. But he added that Rouhani's conciliatory words must be backed by "concrete gestures" that show Iran is not seeking nuclear weapons.
"For 10 years, France has been saying Iran can absolutely benefit from a civilian nuclear program, but it cannot work toward obtaining a nuclear weapon," Hollande told reporters.
It was the first meeting of French and Iranian presidents since 2005, when Jacques Chirac hosted Mohammad Khatami in Paris. Khatami was regarded as a reformer, and he opened a range of social and political freedoms in Iran that have been largely swept aside in recent years.
The US has said all options are on the table, including a military strike, to thwart any attempt by Iran to have a nuclear weapon.