The world's nuclear watchdog has admitted, in a confidential report circulated on Friday, that it has lost track of Iran's most sensitive uranium. The International Atomic Energy Agency says it is “increasingly concerned” about Iran's underground enrichment plant at Isfahan, admitting it does not know the site's exact location or whether it holds nuclear material — and that it cannot verify the fate of 440.9 kilograms of uranium enriched to 60 percent. Agency chief Rafael Grossi is urging Iran to let his inspectors back in.
The number is not a small one. The 440.9 kilograms is the stockpile the agency last verified before the June 2025 strikes — material enriched to 60 percent, a short technical step below the 90 percent of weapons-grade uranium, and enough, if taken that last step, for roughly ten nuclear weapons. Iran is the only country without nuclear weapons ever to have produced uranium at that level. Today, no inspector on earth can say where that stockpile is, how much of it survived, or what state it is in.
The blindness has a history. The agency withdrew its inspectors from Iran for their safety when the strikes began in June 2025, and Tehran formally suspended cooperation the following month. Under Iran's safeguards agreement, stockpiles like this one are supposed to be verified every 30 days; the agency says its loss of continuity of knowledge must be addressed “with the utmost urgency.” Grossi's own best guess, given in March, was that a bit more than 200 kilograms probably remains, most of it in the tunnels at Isfahan — but a guess is all it is, and the new report concedes the agency cannot even pin down the Isfahan plant itself, a facility Iran declared on the eve of the attacks and has never opened to a visit.
The honest picture has another side, and the same agency states it: Grossi has told the UN Security Council that his monitors have identified no repair or reconstruction work at the facilities damaged in the 2025 and 2026 attacks — Fordow, Natanz and the rest show no sign of being rebuilt — and inspectors are at work at the Bushehr power plant, the one site open to them. Israel does not allege that Iran is enriching uranium today. So this is not proof of a bomb programme racing ahead. It is something quieter and, for planners, worse: nobody can prove anything either way.
For America, that gap is the story. President Trump's position is that Iran must never have a nuclear weapon, and American and Israeli strikes were carried out to settle that question. A watchdog that cannot find the uranium keeps the question open — and keeps American forces in the Gulf guarding against the unknown, while every family that drives or heats a home pays for Middle East uncertainty at the pump. Verification is what turns fear into facts, and on Iran's most dangerous material, the verification is gone.
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