IAEA Struggles to Verify Iran's Nuclear Sites as Natanz Struck Again

For an organization whose mandate rests on access — to sites, to officials, to technical data — the International Atomic Energy Agency has rarely found itself operating in conditions as constrained as those it faces in the tenth day of the US-Israeli military campaign against Iran. With inspectors barred from the country, communication lines with Iranian nuclear authorities reduced to near-silence, and conflicting public statements ricocheting between Vienna and Tehran, the IAEA's ability to fulfill its core safeguards function in Iran has been fundamentally compromised.

The crisis broke into public view on March 2, when IAEA Director General Rafael Grossi told the agency's 35-nation Board of Governors that there was "no indication that any of the nuclear installations, including the Bushehr Nuclear Power Plant, the Tehran Research Reactor or other nuclear fuel cycle facilities have been damaged or hit." Within minutes of that statement, Iran's IAEA envoy Reza Najafi walked out to waiting reporters and offered a direct rebuttal: Natanz, he said, had been struck the previous day. Commercial satellite imagery, analyzed independently by the Institute for Science and International Security, subsequently confirmed that Grossi had been working from outdated data — imagery from Colorado-based Vantor showed two strikes on access points to the underground uranium enrichment plant at Natanz, with three surface buildings destroyed.

The Natanz Contradiction: Conflicting Claims, Verified Damage

The Natanz enrichment complex, located outside the city of Qom in central Iran, sits at the heart of the IAEA's monitoring challenge. The underground Fuel Enrichment Plant (FEP) beneath Natanz had already been severely damaged during the 12-day US-Israeli campaign of June 2025 — yet Iran had not permitted the IAEA to return to the bombed facilities in the eight months since those strikes. That ban was already a significant gap in the agency's oversight architecture before the current, larger-scale campaign began.

By March 3, the IAEA issued a formal correction, acknowledging that entrance buildings to the underground FEP had sustained "some recent damage." The agency was careful to note that "no radiological consequence is expected and no additional impact was detected at the FEP itself" — meaning the centrifuge halls beneath the surface appeared not to have been directly struck. David Albright, a former UN nuclear inspector and founder of the Institute for Science and International Security, assessed that the destroyed vehicle access ramp and two personnel entrances to underground centrifuge halls suggested the targets still contained "recoverable centrifuges" or related equipment even after the June 2025 attack.

"While there has been no evidence of Iran building a nuclear bomb, its large stockpile of near-weapons grade enriched uranium and refusal to grant my inspectors full access are cause for serious concern."

— IAEA Director General Rafael Grossi, statement via X, March 3, 2026

The admission reflected a core operational constraint Grossi outlined at a press conference: the IAEA currently has no staff inside Iran, its crisis-response Incident and Emergency Centre (IEC) has been unable to reach Iran's nuclear regulatory authorities, and communication has been reduced to "very limited" contact with Iranian officials. "Until last Thursday, it was very intense," Grossi noted, a reference to the period of active Oman-mediated nuclear talks that concluded days before the US-Israeli strikes began on February 28.

The Enrichment Question: Stockpile Without a Programme

Amid the chaos of active conflict, Grossi sought to draw a careful distinction in public statements — one that carries significant implications for how the international community assesses the justification offered by Washington and Jerusalem for the military campaign. Speaking to NBC News on March 3, Grossi confirmed that IAEA inspectors had found no evidence of "elements of a systematic and structured programme to manufacture nuclear weapons" in Iran. At the same time, he confirmed that Tehran had enriched uranium to 60 percent purity — a level the agency considers far beyond civilian energy needs and technically close to weapons-grade.

"The centrifuges were spinning constantly and producing more and more of that material," Grossi said, noting that Iran's stockpile was theoretically sufficient to produce "more than 10 nuclear warheads. But do they have them? No." The formulation captured the essential paradox the IAEA had been navigating for years: a country accumulating material at a level consistent with weapons capability, but without demonstrable weapons-programme architecture. That ambiguity is, in part, why the Oman-mediated talks — which the US Senate debated whether the executive branch had authority to abandon in favour of military action — had been considered by many analysts as a viable pathway to resolution.

The IAEA's limited contact with Iran is not new, but the conflict has dramatically deepened the gap. Under the Comprehensive Safeguards Agreement Iran holds with the IAEA, and additional protocols negotiated in earlier years, the agency is entitled to regular access to declared nuclear facilities and to pursue clarification of undeclared activities. Iran curtailed that access significantly beginning in February 2021, removing IAEA monitoring cameras and limiting inspector visits. The additional uncertainty introduced by active strikes on nuclear-adjacent infrastructure — even if no materials have been released — makes the IAEA's safeguards picture for Iran the most uncertain it has been in the agency's seven-decade history.

Institutional Constraints: What the IAEA Can and Cannot Do

The IAEA's authority during armed conflict is institutionally constrained in ways that the present crisis has thrown into sharp relief. The agency is a verification and monitoring body, not a security council with enforcement powers. Its Board of Governors can refer matters to the UN Security Council — as it has done with Iran multiple times, most recently in 2022 — but the Security Council's own paralysis over the Iran conflict, documented in repeated vetoed draft resolutions, means the referral pathway is effectively blocked. The IAEA cannot compel access; it can only report on what it cannot verify.

Grossi's public posture has been to assert the agency's technical impartiality while navigating politically charged statements from all sides. Israel's delegate to the Security Council's February 28 emergency session claimed Iran had "fortified its nuclear facilities and violated sanctions" in lieu of permitting IAEA inspections — a characterisation the IAEA has not formally endorsed. Iran, for its part, has consistently framed its enrichment activities as peaceful and safeguarded, a position Grossi has neither confirmed nor flatly rejected, instead documenting outstanding safeguards issues the agency cannot resolve without access.

The broader economic dimensions of the conflict — including how Iran's nuclear uncertainty is driving energy markets and the Brent crude price spike analysed by Global Market Updates — underscore the interconnection between the IAEA's technical mission and global economic stability. Damage to or uncertainty about the Bushehr Nuclear Power Plant, which feeds into Iran's electricity grid, carries potential consequences for regional energy infrastructure that the agency is also monitoring.

The Path Forward: Monitoring Without Presence

In practical terms, the IAEA is now running what amounts to a remote-sensing operation over Iran — interpreting commercial satellite imagery, monitoring publicly available radiation data from neighbouring countries, and maintaining whatever threadbare communication channels remain open with Iranian authorities. Grossi has stated that no elevation of radiation levels above background has been detected in countries bordering Iran, and that no damage has been confirmed at the Bushehr Nuclear Power Plant or the Tehran Research Reactor. Those assurances, while meaningful, rest on the same satellite-and-secondary-source methodology that initially missed the Natanz strikes.

The institutional consequences will extend well beyond the present conflict. Whichever government eventually governs Iran will inherit a nuclear infrastructure whose current status is partially unverified, a stockpile of near-weapons-grade enriched uranium whose precise disposition is unknown, and a relationship with the IAEA that will require extensive diplomatic reconstruction before meaningful monitoring can resume. For an organisation built on the principle that verification is the precondition for trust, the IAEA's present situation in Iran represents a fundamental test of that architecture — one it is currently failing not through any fault of its own, but because the political conditions for its mission have been overtaken by events on the ground.