1. The Enriched Material Was Not Destroyed — It Was Buried

After the bombing of the Natanz and Fordow facilities in June 2025, Iran announced that it had buried its enriched uranium deep beneath the mountains.

However, the International Atomic Energy Agency (IAEA) estimated that Iran possessed 440.9 kilograms of uranium enriched to 60%, an amount sufficient to produce several nuclear weapons if further enriched to 90%.

More concerning, the IAEA has been unable to verify the location of this material since June 2025. This means that a significant portion of it, believed to be at least 200 kilograms, is thought to remain stored in underground tunnels at Isfahan.

In other words, the Americans do not know exactly where this material went or how much of it remains. That alone is enough to keep the threat alive.

2. The Bombing Did Not Fundamentally Change the Timeline

According to assessments by U.S. intelligence itself, the time Iran would need to produce a nuclear weapon did not change fundamentally after the strikes.

Before the war, estimates suggested that Iran would need 3 to 6 months to produce a bomb. After the strikes, the estimate increased to 9 to 12 months, meaning the attacks delayed the timeline by only several months.

The reason is that the strikes targeted buildings and facilities, but not necessarily the enriched material itself, which had reportedly been moved to undisclosed locations before the attacks.

Moreover, the accumulated scientific and technical expertise of Iranian nuclear scientists cannot be destroyed by bombs. That knowledge would allow Iran to rebuild destroyed facilities relatively quickly.

3. Iran Is Rebuilding — Rapidly

Recent satellite imagery reportedly shows that Iran is not waiting. Since the beginning of 2026, intensive reconstruction has been underway at nuclear and military facilities, including Taleghan 2 at the Parchin complex, which is suspected of having been used for experiments related to nuclear warhead design.

The imagery reportedly shows excavators, cranes, and concrete trucks operating at the site, along with new concrete reinforcement designed to make the facility more resistant to future airstrikes.

4. The Real Concern: A Sudden “Breakout”

The U.S. concern is not simply about how many facilities were destroyed or whether those facilities remain operational. It is about “breakout time”, meaning the amount of time Iran would need to produce a single nuclear weapon if it made the political decision to do so.

Since enriched material already exists and the technical knowledge remains available, any Iranian political decision to pursue a bomb could potentially be implemented very quickly and might not be detected in time.

Put more simply: if you have 440 kilograms of uranium enriched to 60%, you are only one technical step away from producing weapons-grade material. That step, raising enrichment from 60% to 90%, does not necessarily require large facilities. It could potentially be carried out at a smaller, concealed site beyond the reach of an air campaign.

5. The Political Dimension: The Threat as a Negotiating Card

There is another factor that is no less important: the Iranian nuclear threat is one of Washington’s strongest arguments for maintaining sanctions and economic pressure.

If that threat disappeared, it would become more difficult for Trump to justify the air and naval blockade, comprehensive economic sanctions, and the continued U.S. military presence in the region.

Therefore, there is an American interest in keeping the threat alive.