A confidential report by the United Nations’ nuclear watchdog circulated to member states and seen by The Associated Press said Wednesday (September 3, 2025) that Iran increased its stockpile of uranium enriched to near weapons-grade levels before Israel launched its military attack on June 13.

The report by the Vienna-based International Atomic Energy Agency said that as of June 13, Iran had 440.9 kilograms (972 pounds) of uranium enriched up to 60%, an increase of 32.3 kilograms (71.2 pounds) since the IAEA’s last report in May.

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The report stated that this figure is “based on the information provided by Iran, agency verification activities between 17 May 2025 and 12 June 2025 (the day preceding the start of the military attacks), and estimates based on the past operation of the relevant facilities.”

That material is a short, technical step away from weapons-grade levels of 90%.

The confidential report also said Iran and the IAEA have not reached an agreement on resuming inspections of sites affected by Israeli and U.S. bombing in June.

The only site inspected since the war has been the Bushehr Nuclear Power Plant, which operates with Russian technical assistance.

The director general of the U.N. nuclear watchdog, Rafael Grossi, said that “technical modalities to enable the full resumption of Agency inspection should be concluded without delay,” the report stated.

The report stated that while the withdrawal of UN inspectors from Iran during the war “was necessary given the overall security situation, Tehran’s “subsequent decision to cut cooperation with the IAEA was ”deeply regrettable.”

As of June 13, Iran’s total enriched uranium stockpile was 9874.9 kilograms, which represents an increase of 627.3 kilograms since the last repot in May, the report said.

The IAEA said that since June 13, it has “not been able to conduct the in-field activities required to collect and verify Iran’s declarations used to estimate the changes to the previously reported stockpile.”

According to the IAEA, approximately 42 kilograms of 60% enriched uranium is theoretically enough to produce one atomic bomb, if enriched further to 90%.

The IAEA also reported that inspectors have not been able to verify Iran’s near bomb-grade stockpile for over two and a half months, which it called “a matter of serious concern.”

UN Security Council permanent members China and Russia backed Iran on Monday in rejecting a move by European countries to reimpose UN sanctions on Tehran loosened a decade ago under a nuclear agreement.

A letter signed by the Chinese, Russian and Iranian Foreign Ministers said a move by Britain, France and Germany to automatically restore the sanctions under a so-called “snapback mechanism” was “legally and procedurally flawed”.

China and Russia were signatories to Iran’s 2015 nuclear deal with world powers, along with the three European countries, known as the E3. U.S. President Donald Trump pulled the United States out of the agreement in his first term in 2018.

The Europeans launched the “snapback mechanism” last week, accusing Iran of violating the deal, which had provided relief from international financial sanctions in return for curbs to Iran’s nuclear programme.

The letter published by Iran’s Foreign Minister Abbas Araqchi in a post on X on Monday said that the course taken by Britain, France, and Germany “abuses the authority and functions of the UN Security Council”.

Iran has long since broken through the limits on uranium production set under the 2015 deal, arguing that it is justified in doing so as a consequence of Washington having pulled out of the agreement. The deal expires in October this year, and the snapback mechanism would allow sanctions that were lifted under it to take effect again.

Iran and the E3 held talks aimed at a new nuclear agreement after Israel and the U.S. bombed Iran’s nuclear installations in mid-June. But the E3 deemed that talks in Geneva last week did not yield sufficient signals of readiness for a new deal from Iran.

“Our joint letter with my colleagues, the foreign ministers of China and Russia, signed in Tianjin, reflects the firm position that the European attempt to invoke snapback is legally baseless and politically destructive”, Iran’s foreign minister said in his post on X.