"We will have to see how in the coming days we address these violations with the will to press ahead in the talks."
Iran's nuclear deal with major powers only lets Tehran enrich uranium to up to 3.67% purity, one of many limits that it breached more than a year ago.
Trump's withdrawal prompted Iran to steadily overstep the accord's limits on its nuclear program designed to make it harder to develop an atomic bomb - an ambition Tehran denies.
Europe is pushing for an IAEA resolution on Iran, despite Russia and Iranian warnings. Iran won’t meet with the US or Europeans unless sanctions are lifted by Washington.
Iran began breaching its nuclear deal with major powers step by step in 2019 in response to US President Donald Trump's withdrawal from the deal and Washington's reimposition of sanctions on Tehran.
US announces new round of sanctions after Tehran moves to produce uranium metal; Biden appoints new negotiator.
The IAEA official added that Iran had given design information about its research to the International Atomic Energy Agency.
Iran recently announced that it resumed 20% uranium enrichment at an underground nuclear facility.
Activity at Fordow and Natanz are seen as early brinkmanship with the incoming Biden administration
"The incident has caused significant damage but there were no casualties."