Iranian President Hassan Rouhani has said he wants to reach a deal over Iran's nuclear programme within six months.
He told the Washington Post: "The only way forward is for a timeline to be inserted into the negotiations that's short.
"The shorter it is, the more beneficial it is to everyone. If it's three months that would be Iran's choice, if it's six months that's still good. It's a question of months not years."
Read more: Rouhani's address to the UN general assembly
Benjamin Netanyahu branded the Iranian President's UN speech "cynical" and said that Iran was buying time to develop nuclear weapons capability.
"It was a cynical speech full of hypocrisy," Netanyahu said in a statement.
"It had no practical suggestion to stop Iran's military nuclear programme and no commitment to fulfil U.N. Security Council decisions. That exactly is the Iranian plan, to talk and buy time in order to advance Iran's capability to obtain nuclear weapons."
Iran denies it is trying to build nuclear weapons and says its programme is for peaceful purposes.
Iran's President Hassan Rouhani hopes to bring his country out of diplomatic isolation - but despite his new tone and the promise of increased flexibility on Tehran's nuclear program, some critics warn the West is falling into a clever trap.
ITV News Washington Correspondent Robert Moore reports.
Iran's President Hassan Rouhani said Iran is prepared to reach a "framework" for managing the country's differences with the US, and is willing to engage immediately in "time-bound" talks on the Iran nuclear issue.
Iran's President Hassan Rouhani has told the UN general assembly that nuclear weapons and weapons of mass destruction have no place in Iran's security and defence doctrine.
He also expressed hope that the Obama administration will have political will to avoid the influence of "warmongering pressure groups" on the Iran nuclear issue.
Iran's President Hassan Rouhani has said that sanctions against Tehran are "violent, pure and simple," in an address to the UN general assembly.
President Barack Obama and Iran's President Hassan Rouhani will not meet while at the United Nations, with the Obama Administration saying it proved "too complicated" for the pair to meet.
A potential encounter was on the cards, and would have been the first face-to-face contact between US and Iranian government heads since before the 1979 Islamic revolution.
The White House was open to a meeting, but Iranian officials indicated it was too complicated, the US official said.
President Barack Obama told the UN general assembly that recent debates over America's involvement in Syria show the "danger for the world is not an America that is too eager to immerse itself in the affairs of other countries."
– President Barack Obama
The danger for the world is that the US, after a decade of war, rightly concerned of issues back home, aware of the hostility our engagement has engendered throughout the Muslim world may disengage, creating a vacuum of leadership no other nation is ready to fill - I believe such disengagement would be a mistake.
I believe America must remain engaged for our own security, but I also believe the world is better for it.
John Kerry, the US Secretary of State, will sign an arms trade treaty tomorrow, on the sidelines of the UN general assembly, Reuters reports.
– President Barack Obama
We will be engaged in the region for the long haul.
For the hard work of forging freedom and democracy is the task of a gneration and this includes efforts to resolve sectarian tensions that continue to surface in places like Iraq, Bahrain and Syria.