The five permanent members of the UN Security Council plus Germany are trying to secure a mammoth deal by next month to reduce in scope Iran's nuclear programme and ease fears the Islamic republic will get atomic weapons.
Iran denies seeking to make a bomb and wants punishing UN and Western sanctions lifted. Neither Israel nor the United States have ruled out military action to stop Iran from getting a nuclear weapon.
"Iran is ready for a resolution and made rational proposals," the official IRNA news agency quoted Foreign Minister Mohammad Javad Zarif as saying.
"But the excessive demands of the other party could prevent an agreement," he added. "At that time the world will know who was responsible for the deadlock in the nuclear negotiations."
Zarif had on June 20 said Iran and world powers are yet to find common ground on the main issues in the nuclear talks.
"We feel there are still maximalist stances on the other side, which I think should be dropped," Zarif had said.
The negotiations can be extended by up to six months beyond July 20, when an interim deal struck in November expires, but for now both sides were still aiming to get a deal by that date.
Negotiators have said the main sticking points are the timetable for a full lifting of crippling US and European Union sanctions, and the scale to which Iran would be allowed to continue uranium enrichment.
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