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Russia-Ukraine War 2026
3AUG

461 kg of uranium no one can verify

3 min read
10:16UTC

The Institute for Science and International Security read 265 to 287 kg of highly enriched uranium in Esfahan's backfilled tunnels from satellite imagery, against the 440.9 kg the memorandum commits Iran to destroy under inspectors who cannot enter the country.

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ConflictDeveloping
Key takeaway

Inspectors cannot enter Iran, so the uranium the deal commits Iran to destroy stays uncounted.

The Institute for Science and International Security, a Washington non-proliferation think tank, used June 2026 satellite imagery to place Iran's 60 per cent enriched uranium across three hardened sites: 265 to 287 kg in backfilled tunnels at Esfahan, 80 kg at Fordow and 74 to 96 kg at Natanz. That totals as much as 461 kg, against the 440.9 kg the Islamabad memorandum commits Iran to destroy under international supervision. 1

Each figure comes from satellite imagery, not from an on-site count. The International Atomic Energy Agency (IAEA), the UN's nuclear watchdog, has had no inspector access to Iran for more than 100 days, and the Esfahan tunnel entrances are backfilled. Its director-general Rafael Grossi, speaking at Fukushima on 26 June, said access "is going to happen" and that work on modalities and dates would begin soon, but named no date and holds no signed access instrument. 2

Iran's deputy foreign minister Kazem Gharibabadi the same day ruled out access before a final deal and the lifting of all sanctions, deepening the impasse Grossi described . US envoy Steve Witkoff's claim that Iran had sent the IAEA a letter clearing inspectors stayed unconfirmed by both Iran and the agency. The memorandum names the IAEA to supervise the destruction of the stockpile, yet the inspectors it names cannot enter the country to begin. 3

Deep Analysis

In plain English

The International Atomic Energy Agency, the United Nations body that monitors nuclear programmes worldwide, has been unable to enter Iran's nuclear facilities for more than 100 days. The only information available about Iran's stockpile of highly enriched uranium comes from commercial satellite photos taken from space, not from inspectors on the ground. A June 2026 analysis by a US non-proliferation think tank estimated Iran holds around 460 kg of uranium enriched to weapons-capable levels, mostly in tunnels at a site called Esfahan. On 26 June, Iran's deputy foreign minister said there are no plans to let inspectors back in until a final deal is completely agreed and all sanctions are lifted. That condition makes the inspection practically impossible before the Islamabad agreement's 60-day window expires in mid-August.

What could happen next?
  • Risk

    Gharibabadi's sequencing, inspection access only after a completed final deal and full sanctions termination, means the 21 August General Licence X expiry arrives before the conditions for inspection can be met, and the entire Islamabad disarmament architecture collapses by default rather than by decision.

    Short term · Assessed
  • Meaning

    The gap between the MOU's 440.9 kg commitment and the Bulletin of the Atomic Scientists' 540 kg satellite estimate means the deal may have been written to a stockpile figure Iran itself cannot verify, creating a potential compliance dispute even if inspectors re-enter.

    Medium term · Reported
  • Precedent

    A 100-day verification blackout during a formal nuclear disarmament window establishes that the IAEA's monitoring framework can be suspended without triggering an automatic consequence, reducing the deterrent value of future safeguards agreements with states that have domestic political capacity to weather international pressure.

    Long term · Reported
Sources:Al Jazeera·Institute for Science and International Security
Mentions:IAEA →Rafael Grossi →Kazem Gharibabadi →Institute for Science and International Security →Iran →Fordow →Islamabad Memorandum of Understanding →General License X →Bulletin of the Atomic Scientists →Beijing →Islamabad →Arms Control Association →Iraq →Washington →United Nations →China →Steve Witkoff →Isfahan →Natanz Fuel Enrichment Plant →
First Reported In

Update #140 · US bombs Iran, and the oil market shrugs

Al Jazeera· 28 Jun 2026
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Causes and effects
Caused by
Three inspection claims, no signed paper
Grossi's 26 June Fukushima statement advanced his 25 June modalities discussions while Gharibabadi's written refusal deepened the verification impasse the same day.
Occurred 25 Jun 2026
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Witkoff claims an unseen IAEA letter
Witkoff's unverified IAEA letter claim of 26 June was directly contradicted by Gharibabadi's public statement that access requires a final deal and all sanctions lifted.
Occurred 26 Jun 2026
Read story →
The oil licence Trump finally signed
GL X explicitly references IAEA supervision in its recitals; the 100-day inspection blackout makes the MOU's core disarmament clause operationally unenforceable.
Occurred 22 Jun 2026
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This Event
461 kg of uranium no one can verify
The deal's central nuclear promise cannot be checked by the agency the deal names to check it.
Led to
Qom clerics draw Tehran's red line
Gharibabadi's refusal of IAEA access before a final deal reflects the same clerical ceiling Qom and the Assembly now state publicly.
Occurred 1 Jul 2026
Read story →
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