Iran has been urged by China and the US to respond “positively” to an international offer over its nuclear programme, US officials say.
The call came ahead a rare, high-level meeting between the US and Iran.
Iranian President Hassan Rouhani called for a world without nuclear weapons, hours after saying Tehran wanted a deal in three to six months.
The West suspects Tehran is trying to develop a nuclear weapon, a claim strongly denied by Iran.
Iran has been negotiating over the issue since 2006 with the P5+1 – the five permanent members of the UN Security Council, plus Germany.
On Tuesday, Hassan Rouhani told the UN General Assembly that he was prepared to engage in “time-bound and results-oriented” talks.
On Thursday, Hassan Rouhani called from stricter controls on nuclear weapons as part of a global effort to eventually rid the world of them.
“No nation should possess nuclear weapons; since there are no right hands for these wrong weapons,” he said, speaking on behalf of the Non-Aligned Movement at the General Assembly.
Hassan Rouhani called from stricter controls on nuclear weapons as part of a global effort to eventually rid the world of the
The P5+1 has asked to halt production and stockpiling of uranium enriched to 20% – a step away from achieving a nuclear weapons capability.
It also demanded Iran shut down the Fordo underground enrichment facility.
In return, it offered to ease the sanctions that have severely affected Iran’s economy.
“Both the US and China believe that Iran should cooperate with the P5+1 and should respond positively to the proposals that are on the table,” a US official told journalists at the UN.
Later, Foreign Minister Mohammad Javad Zarif is due to meet US Secretary of State John Kerry as well as diplomats from the UK, France, Russia, China and Germany on the sidelines of the annual UN General Assembly summit in New York.
It will be the highest level direct contact between the US and Iran for six years.
President Barack Obama has welcomed the new Iranian president’s more “moderate course”.
Barack Obama told the UN on Tuesday that the US wanted to resolve the nuclear issue peacefully, but was determined to prevent Iran from developing a nuclear weapon.
Hassan Rouhani has said he is fully empowered by Iran’s Supreme Leader Ayatollah Khamenei to negotiate on the issue.
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President Barack Obama has said recent moves by Iran should offer the basis for a “meaningful agreement” on its nuclear programme.
Speaking at the UN General Assembly’s annual meeting, Barack Obama said words now had to be “matched by actions that are transparent and verifiable”.
The US leader recently exchanged letters with his newly-elected counterpart over the nuclear issue.
Barack Obama also called for a strong UN resolution on Syria’s chemical arms.
He said the purpose of such a resolution should be “to verify that the [Bashar al-Assad’s] regime is keeping its commitments” to remove or destroy its chemical weapons.
The deal for Syria to hand over its chemical weapons by mid-2014 was agreed earlier this month between the US and Russia, averting a possible Western military strike.
Differences have since emerged over whether the deal should be enforced by a UN Security Council resolution under Chapter VII of the organization’s charter, which would authorize sanctions and the use of force if Syria did not comply with its obligations.
Opening the UN summit on Tuesday, Secretary-General Ban Ki-moon said the Syrian government must “fully and quickly honor” its obligations under the deal.
“The international community must bring to justice the perpetrators of the use of chemical weapons in Syria, confirmed unequivocally by the UN investigation mission,” he said.
On Iran, Barack Obama said the US wanted to resolve the nuclear issue peacefully, but was determined to prevent Iran from developing a nuclear weapon.
Speaking at the UN General Assembly’s annual meeting, Barack Obama urged for diplomatic push on Iran nuclear programme
“The roadblocks may prove to be too great, but I firmly believe the diplomatic path must be tested” he said, adding that he had urged his Secretary of State John Kerry to pursue a deal.
“Iran’s genuine commitment to go down a different path will be good for the region and the world,” Barack Obama said.
Iran insists it is a peaceful programme, but Western countries suspect it of seeking to develop a nuclear weapon.
Iran’s new President, Hassan Rouhani, has said he wants to present his country’s “true face”.
A meeting between Barack Obama and Hassan Rouhani – the first such encounter since the 1979 revolution – has not been ruled out.
There is also speculation that he and Barack Obama may shake hands on the sidelines of the General Assembly.
On Thursday, Iran’s Foreign Minister Mohammad Javad Zarif will discuss its nuclear programme with John Kerry and other diplomats.
A foreign ministry spokeswoman in Tehran said the meeting represented the “beginning for nuclear talks in the new era”.
The meeting will be attended by foreign ministers from the other four permanent UN Security Council members – the UK, China, France and Russia – and also Germany, which make up the so-called P5+1.
Hassan Rouhani has said he is ready to restart stalled nuclear talks without preconditions.
Western ministers will want to see an Iranian willingness to make concessions on its nuclear programme if there is to be any lifting or lightening of UN and Western sanctions.
Iran for its part will want a clear indication that the US is willing to treat Iran with the respect it believes it deserves as a significant regional player.
The EU’s foreign policy chief, Baroness Catherine Ashton, met Javad Zarif on Monday and described their discussion as “good and constructive.” She said her team would hold talks with Javad Zarif again in October in Geneva to assess progress.
Last week, Hassan Rouhani said that his country would never “seek weapons of mass destruction, including nuclear weapons”, and that his goal was “constructive engagement” with the international community.