Iran repeated Monday its nuclear program was peaceful and called on the U.S. to take "practical" steps for any form of talks, two days after the U.S. and its allies expressed their "grave" concern on the sidelines of a G20 meeting.

Iranian Foreign ministry spokesman Saeed Khatibzadeh told reporters in Tehran that Western positions were "incompatible with reality and will not bring constructive results."

The Western statement was made on Saturday following leaders' discussions of Iran's offer to resume discussions on reviving the 2015 nuclear deal.

U.S. President Joe Biden previously said that he is ready to re-enter the agreement so long as Iran also returns to full compliance by rolling back nuclear activities that it undertook in response to Trump's sanctions.

Khatibzadeh rejected the statement, claiming that the U.S. is still adopting a policy of maximum pressure. He urged Washington to first take "practical" steps if it eyes for any form of talks.

Washington has not only penalized companies cooperating with Iran, but also punished its own allies in order to prevent Iran's trade and economic ties, he said.

The Islamic republic will not hold talks in any format with the United States as long as these realities in the policies of the United States continue to exist, he added.

Tehran hasn't had any direct or indirect talks with the United States since the latter's unilateral withdrawal from the nuclear deal, also known as the Joint Comprehensive Plan of Action (JCPOA), in 2018.

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The spokesperson also rejected Western's claim which said that Tehran "has accelerated the pace of provocative nuclear steps, such as the production of highly enriched uranium and enriched uranium metal."

"Contrary to the statement, the production of uranium metal and highly enriched uranium, as already asserted in the past, is carried out for peaceful purposes and for civilian uses, including for medical supply and for use as fuel in the Tehran research reactor," said Khatibzadeh.

Iran recently agreed to start the stalled nuclear talks with the remaining parties to the JCPOA, aimed to restore the deal. It was announced that the talks will resume in November.

"When these talks begin... in the next two or three weeks, Iran will follow them with particular attention because negotiating to negotiate is not part of its politics," Khatibzadeh said.

(With input from Xinhua, AFP)