Iran said on Monday it will soon present a counter-proposal on a nuclear deal with the United States, after it had described Washington's offer as containing "ambiguities".
Tehran and Washington have held five rounds of talks since April to thrash out a new nuclear accord to replace the deal with major powers that US President Donald Trump abandoned during his first term in 2018.
Foreign ministry spokesman Esmaeil Baqaei criticised the US proposal as "lacking elements" reflective of the previous rounds of negotiations, without providing further details.
"We will soon submit our own proposed plan to the other side through (mediator) Oman once it is finalised," Baqaei told a weekly press briefing.
"It is a proposal that is reasonable, logical and balanced, and we strongly recommend that the American side value this opportunity."
Also on Monday, Deputy Foreign Minister Majid Takht-Ravanchi told state news agency IRNA that Iran's response "is a framework for agreement".
"If we reach an understanding on this framework in principle, further extensive negotiations will begin on its details," he added.
Iran currently enriches uranium to 60 percent, far above the 3.67-percent limit set in the 2015 deal and close though still short of the 90 percent needed for a nuclear warhead.
Western countries, including the United States, have long accused Iran of seeking to acquire atomic weapons, while Iran insists its nuclear programme is for peaceful purposes.
The United Nations nuclear watchdog on Monday began a Board of Governors meeting in Vienna that will last until Friday to discuss Iran's nuclear activities among other topics.
"I call upon Iran urgently to cooperate fully and effectively with the International Atomic Energy Agency," said agency chief Rafael Grossi in his opening speech.
"Unless and until Iran assists the agency in resolving the outstanding safeguards issues, the agency will not be in a position to provide assurance that Iran's nuclear programme is exclusively peaceful," he added.
Britain, France and Germany, the three European countries that are party to the 2015 deal, are currently weighing whether to trigger the sanctions "snapback" mechanism in the accord.
The mechanism would reinstate UN sanctions in response to Iranian non-compliance -- an option that expires in October.
On Friday, Araghchi warned European powers against backing a draft resolution at the IAEA accusing Tehran of non-compliance, calling it a "strategic mistake".
On Monday, Baqaei said Iran has "prepared and formulated a series of steps and measures" if the resolution is passed.
"Without a doubt, the response to confrontation will not be more cooperation," he added.
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