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TEHRAN, IRAN —United Nations nuclear watchdog chief Rafael Grossi arrived in Tehran Friday for talks after his agency's inspectors in Iran found uranium particles enriched to just under weapons-grade level.
The visit by the head of the International Atomic Energy Agency comes with the Vienna-based organization seeking Iran's increased cooperation over its nuclear activities.
Grossi was greeted at the airport by Behrouz Kamalvandi, spokesman for the Atomic Energy Organization of Iran, and later met with its head, Mohammad Eslami.
Details of their discussion were not immediately available.
The Argentinean diplomat is also due to hold talks with President Ebrahim Raisi and other Iranian officials during his two-day visit.
A confidential IAEA report seen Tuesday by AFP said uranium particles enriched up to 83.7% - just under the 90% needed to produce an atomic bomb - had been detected at Iran's underground Fordo plant about 100 kilometers (60 miles) south of the capital.
Tehran denies wanting to acquire atomic weapons and said it had not made any attempt to enrich uranium beyond 60% purity. Iran's government noted that "unintended fluctuations...may have occurred" during the enrichment process.
The discovery came after Iran had substantially modified an interconnection between two centrifuge clusters enriching uranium, without declaring it to the IAEA.
On Thursday, the agency tweeted that Grossi would "travel to Tehran for high-level meetings at the invitation of Iran's government."
A diplomatic source told AFP that Grossi would also meet Raisi to "relaunch the dialogue" on Iran's atomic work and to "reset the relationship at the highest level."
During the visit, the IAEA director general will try to secure "more access to the [Fordo] site, more inspections," the diplomatic source said.
On Thursday, France, a signatory to a 2015 deal that promised Iran relief from biting economic sanctions in exchange for curbs on its nuclear activities, described the new enrichment development as "unprecedented and extremely serious."
The IAEA chief's visit comes amid deadlock in negotiations on reviving the landmark 2015 accord, known formally as the Joint Comprehensive Plan of Action or JCPOA.
'Greater cooperation'
Restrictions set out in the deal, including the 3.67% enrichment threshold, were intended to prevent Iran from developing a nuclear weapon.
The United States unilaterally withdrew from the pact in 2018 under then-president Donald Trump and reimposed sanctions, prompting Iran to suspend the implementation of its own commitments.
Negotiations aimed at reviving the deal started in 2021 but have been stalled since last year.
Window for agreement 'still open'
Grossi's visit is being seen in Iran as another indication that a dialogue-based approach to resolving the nuclear standoff is possible.
"It is hoped that this trip will form the basis for greater cooperation and a clearer horizon between Iran and the IAEA," Kamalvandi said before Grossi's arrival.
Foreign Minister Hossein Amir-Abdollahian said in an interview with CNN that "the window for an agreement on negotiations to lift sanctions is still open, but this window will not be open forever."
Depending on the outcome of Grossi's trip, the U.S., Britain, France and Germany will decide whether to submit a draft resolution censuring Iran to the IAEA board of governors, which is due to convene next week in Vienna.
In November 2022, Western nations criticized Iran for its lack of cooperation regarding traces of enriched uranium found at three undeclared sites.
Grossi's last visit to Iran took place in March 2022 and was focused on the three undeclared sites.
The IAEA said Grossi would hold a news conference upon his return to Vienna late Saturday afternoon.