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4JUN

Inspectors promised, no date, 240kg lost

3 min read
10:20UTC

Vance said IAEA inspectors will absolutely return to Iran under the memorandum, with a start date to be fixed at Friday's ceremony. No date was set. The agency had already declared it could no longer account for 440.9kg of Iranian highly enriched uranium.

EconomicDeveloping
Key takeaway

Inspectors are promised but undated, and 240kg of highly enriched uranium remains unaccounted for.

JD Vance said on 15 June that IAEA inspectors "absolutely will return" to Iran under the memorandum, with a start date to be confirmed at Friday's Geneva ceremony. 1 The IAEA is the UN's International Atomic Energy Agency, the body that verifies states are not diverting nuclear material to weapons. Vance set no date, and the nuclear question that began the war is parked for 60 days of technical talks .

Inspectors would be hunting material that has already gone missing. The IAEA declared a loss of continuity on Iran's 440.9kg highly enriched uranium stockpile after 97 days locked out of the country, with roughly 240kg still unaccounted for. Foreign minister Araghchi had pledged to protect the material, and the agency's Grossi warned that any transfer of it must be declared ; neither the pledge nor the warning tells inspectors where the uranium now sits.

Loss of continuity is a technical term with a blunt meaning: the agency can no longer trace the chain of custody on the stockpile, so it cannot say whether the material has been moved, diluted or hidden. A promise that inspectors will return, with no date attached, does nothing to close that gap. The one file that started the war on 28 February is the file the memorandum pushes furthest down the road.

Deep Analysis

In plain English

The International Atomic Energy Agency (IAEA) is the United Nations body that checks that countries are not secretly building nuclear weapons. It does this by sending inspectors to visit nuclear sites and count the fissile material. Iran expelled the IAEA inspectors on 28 February 2026 and kept them out for 97 days. During that time, the agency lost track of roughly 240 kilograms of Iran's declared stockpile of 440.9 kilograms of uranium enriched to 60 per cent purity. Vance said on 15 June that inspectors 'absolutely will return' under the MOU. But no date was given, and the MOU defers all nuclear issues to a separate 60-day negotiation window. The problem is that 240 kg of 60 per cent-enriched uranium remains unaccounted for. That is enough, if further enriched, to make several nuclear weapons. Until inspectors are back inside Iran and can physically recount the material, no one outside Iran knows where it is.

First Reported In

Update #129 · Iran deal signed, but no paper to show

NBC News· 16 Jun 2026
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