Conceptual illustration of an underground facility in arid mountains with inspection equipment in the foreground
Iran

Iran’s Nuclear Sites Were Bombed. Can Anyone Verify What Was Destroyed?

Washington says its strikes devastated Iran’s nuclear programme. International inspectors still cannot independently establish what survived.

In Washington, two official strategy documents published within months of each other describe the same military operation in strikingly different language.

The US National Security Strategy released in 2025 said American attacks had significantly degraded Iran’s nuclear programme. The National Defense Strategy published in January 2026 went further. It said the programme had been obliterated.

Both assessments concerned the June 2025 strikes against Iranian nuclear facilities.

Yet a Congressional Research Service report updated in October 2026 presents a more complicated picture. The International Atomic Energy Agency (IAEA) has not been able to inspect the facilities attacked in June 2025. The effects of further US-Israeli strikes beginning on February 28, 2026, remain uncertain in important respects.

How can a government declare a nuclear programme destroyed when international inspectors cannot independently establish what survived?

The answer matters because military success and nuclear verification are not the same thing.

What Washington’s own documents reveal

The difference between degraded and obliterated is not merely a matter of rhetoric.

A severely degraded nuclear programme may have lost important equipment while retaining technical expertise and some capacity for recovery. An obliterated programme suggests far more comprehensive destruction.

The 2026 National Defense Strategy used the stronger description of the 2025 operation. In the same document, however, it acknowledged that Iran might attempt to pursue nuclear weapons again.

That qualification deserves attention.

A nuclear programme consists of more than buildings and machinery. It includes trained personnel, uranium stocks and industrial knowledge. An attack may destroy centrifuges without eliminating every component of the wider programme.

The United States possesses intelligence capabilities that extend beyond what international inspectors can observe. Classified assessments may include satellite surveillance and intercepted communications. But without access to the underlying evidence, independent observers cannot establish how much of the destruction claims those assessments support.

Nor should we assume that Washington’s use of the word obliterated represents a technical finding by the IAEA.

The agency’s job is different. It must verify nuclear material and assess whether a state’s declarations meet its safeguards obligations.

The uranium that inspectors cannot account for

Before the June 2025 strikes, the IAEA estimated that Iran possessed 440.9 kilograms of uranium enriched to 60 percent purity.

For comparison, most commercial nuclear power reactors use uranium enriched to much lower levels. Weapons-grade uranium is generally enriched to about 90 percent.

Further enrichment of material already at 60 percent could produce weapons-grade uranium. But that does not mean Iran has manufactured a nuclear weapon.

A weapon requires additional design and production work, and the distinction should not disappear from public debate.

The problem facing inspectors today concerns the material they previously monitored.

Some uranium may remain at damaged underground installations. Other quantities may have been moved or stored elsewhere. Without reliable access and updated accounting records, inspectors cannot independently establish the present inventory.

The old figure of 440.9 kilograms must therefore be treated as a historical estimate, not the amount proven to remain in Iran today.

This uncertainty does not establish that Iran has secretly resumed enrichment. It also does not justify concluding that all sensitive material was destroyed.

The nuclear inspection crisis began years before the strikes

The breakdown in monitoring did not start with the bombing.

The 2015 nuclear agreement, formally known as the Joint Comprehensive Plan of Action, placed restrictions on Iran’s nuclear activities in exchange for sanctions relief.

The United States withdrew from the agreement in May 2018. Iran subsequently exceeded several of its restrictions.

In February 2021, Tehran stopped provisionally implementing the IAEA Additional Protocol and ended important monitoring arrangements connected with the agreement.

Inspectors gradually lost access to information about parts of Iran’s nuclear programme, including some centrifuge-related activities.

By the time the June 2025 strikes occurred, the verification record already contained serious gaps.

The attacks compounded the problem. The IAEA withdrew inspectors for safety reasons, and subsequent restrictions prevented it from restoring normal safeguards work at the attacked facilities.

Military operations in 2026 added another layer of uncertainty.

The inspection crisis therefore has two causes that should not be confused: Iran’s restrictions on international monitoring and the damage and disruption associated with military attacks.

Intelligence assessments are not international verification

American intelligence agencies assess threats to US national security. The IAEA examines nuclear activities under international safeguards agreements.

Their evidence may overlap, but their responsibilities do not.

An intelligence agency may assess that a facility has stopped operating after an airstrike. Such a judgment might draw on observations of damaged power systems or other indicators.

An IAEA inspector must answer different questions. How much nuclear material was declared before the attack? What quantities can be physically measured afterward? Can the operator account for transfers between facilities? Is there evidence of undeclared nuclear activity?

A damaged enrichment plant does not answer those questions by itself.

In its 2026 Annual Threat Assessment, the US intelligence community stated that Iran had been trying to recover from the severe damage caused to its nuclear infrastructure during the 2025 war.

That assessment is revealing. It indicates that US intelligence was examining Iranian recovery efforts after the earlier destruction.

It does not, by itself, demonstrate that Iran had restarted enrichment or built a nuclear weapon.

The IAEA’s safeguards findings also have limits. Lack of access prevents inspectors from reaching firm conclusions that they might otherwise establish through examination of records and nuclear material.

A government can make a military damage assessment without international inspection. What it cannot do is turn that assessment into an independent safeguards finding simply by declaring success.

Why rebuilding the inspection record could be difficult

Suppose Iran allowed inspectors to return to its attacked nuclear facilities.

They could examine accessible stocks and compare new measurements with earlier declarations. They could investigate discrepancies and ask operators to account for material that had been transferred.

Environmental sampling might reveal evidence of nuclear activity at particular locations.

Yet access today would not automatically explain everything that happened during the period when inspections were interrupted.

Records may be incomplete. Equipment may have been moved. Physical damage may prevent inspectors from examining some storage areas.

Inspectors would need to establish not only whether the material Iran declared could be found, but also whether those declarations were complete.

In a specialist analysis published on October 22, 2026, Uppsala University’s Alva Myrdal Centre examined the growing challenge of restoring verification of Iran’s nuclear material.

The longer an inspection system operates without reliable continuity of knowledge, the harder it may become to reconstruct the nuclear activities that occurred during the gap.

Iran’s security concerns do not cancel safeguards obligations

Iran maintains that its nuclear programme serves peaceful purposes. Its government has also argued that repeated military attacks create serious security risks for nuclear installations.

An inspector cannot safely enter every damaged building immediately after an attack. Nuclear facilities may contain structural hazards or damaged industrial equipment.

But physical danger at a particular site does not automatically remove Iran’s legal obligations under its safeguards agreement.

The IAEA still requires information needed to account for declared nuclear material.

Iran wants security assurances and relief from economic pressure. Washington demands restrictions on Iran’s nuclear capabilities. International inspectors need workable access and reliable records.

A negotiated agreement must address these problems without treating them as interchangeable. A diplomatic assurance that Iran will not produce a weapon cannot substitute for evidence gathered through safeguards inspections.

Did the attacks reduce the nuclear threat?

There is credible reason to conclude that the June 2025 strikes severely damaged important elements of Iran’s known nuclear infrastructure.

The US intelligence community has acknowledged that damage while warning about Iran’s potential efforts to rebuild.

Damaged equipment may take considerable time to repair or replace. Destroyed facilities can interrupt production. The loss of industrial capacity can matter even when nuclear material remains unaccounted for.

But the scale and duration of those effects require careful assessment.

I examined the dangers of overstating nuclear escalation in my earlier article, The Nuclear Threshold: Why America’s Costly Iran War Does Not Make a Nuclear Strike Inevitable.

Evidence that Iran retains nuclear material does not establish an imminent weapon. Evidence that American bombs damaged enrichment facilities does not establish that the entire programme has ceased to exist.

Governments may choose to act on intelligence estimates. The public should still be told which conclusions have independent confirmation and which remain uncertain.

A military victory still needs a political result

The central weakness of a purely military approach is that it cannot by itself create a durable verification arrangement.

The United States can use force to disrupt enrichment infrastructure. Iran can attempt to rebuild parts of that infrastructure or retain knowledge of how to do so.

What neither side can achieve through bombing alone is a credible record of all relevant nuclear material and activities.

The broader strategic difficulty appeared in my earlier analysis, Can America Win Battles Against Iran but Lose the War?

Military operations can destroy targets without securing the political conditions needed for lasting stability.

An agreement would require Iran to provide declarations that inspectors could test. It would require practical arrangements for access and enough stability to let inspections continue.

Without such arrangements, the parties could emerge from another period of fighting with more damage but little additional certainty.

What would count as genuine success?

The question is not whether the United States managed to damage Iran’s nuclear installations. The available evidence supports substantial damage from the 2025 campaign.

The harder question is whether the international community can establish what remains of Iran’s nuclear capabilities and prevent prohibited activities from going undetected.

Iran would need to provide updated nuclear-material declarations and cooperate in resolving discrepancies. Inspectors would need meaningful access to the facilities and material covered by safeguards.

The IAEA would then have to evaluate what it could verify and disclose any limitations that remained.

Those findings might confirm that important nuclear capabilities had been eliminated. They might reveal surviving material or equipment that required further monitoring.

Either result would be more useful than a political claim that cannot be independently tested.

Washington’s strategy documents use confident language about the destruction of Iran’s nuclear programme, while international inspectors still lack the access needed to establish the full condition of the attacked facilities.

I would judge the outcome by the evidence that emerges when inspections resume.

A destroyed centrifuge is a measurable military result. A verified account of Iran’s nuclear material would be a different achievement, one that remains unfinished.

Editorial disclosure: This independent analysis uses publicly available US government documents, Congressional Research Service reporting, IAEA safeguards findings and specialist research. It does not rely on classified intelligence or original interviews. The featured image is an AI-generated conceptual illustration, not an actual photograph of an Iranian nuclear facility.

Sources

Leave a Reply