Secretary of State John Kerry and new Iranian Foreign Minister Mohammad Javad Zarif will join counterparts from Britain, China, France, Germany and Russia at the meeting at the United Nations headquarters, US officials said yesterday.
High-level contacts between Iranian and US officials have been rare since the 1979 Islamic Revolution. But in another sign of a possible thaw, the White House said it was not ruling out a meeting between President Barack Obama and new Iranian counterpart Hassan Rowhani on the sidelines of this week's UN General Assembly.
Rowhani said in a US television interview last week that Iran would "never" build a nuclear bomb. But the United States and its allies still believe Tehran wants that capability and are waiting for signs that Rowhani is serious about better relations.
The talks "will give our ministers a sense of their level of seriousness and whether they are coming with concrete new proposals and whether this charm offensive actually has substance to it," a senior US State Department official said.
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Zarif said he spoke to EU foreign policy chief Catherine Ashton of Iran's "political will as well as a conceptual framework to reach a solution that would ensure the Iranian people's rights and would lift the sanctions."
"It is evident from her post-meeting interview that she took it postively," Zarif commented on the social media site.
The United States, which has spearheaded an international drive to cut Iran's oil exports, has insisted it will not lift sanctions without progress.
The international powers made a new proposal to Tehran this year, before Rowhani's election, believed to offer some sanctions relief in return for a scaling back of Iran's uranium enrichment.
"There's a sense that we never actually got a firm response or a detailed response to that," the US official said.
Zarif also met in New York with British Foreign Secretary William Hague, who called for Iran to take "concrete steps" to back Rowhani's calls for better ties.