Breaking news: The next major test of the U.S.-Iran nuclear track may not be whether inspectors are allowed back into Iran. It may be whether they can still verify what happened to Tehran’s enriched uranium stockpile after months of war, strikes, and interrupted monitoring.
Radio Free Europe/Radio Liberty reported Thursday that former nuclear negotiators and nonproliferation experts see the inspection question as a difficult verification problem, not just a diplomatic dispute. The issue is especially sensitive because the location of Iran’s roughly 450 kilograms of highly enriched uranium is unclear after U.S. and Israeli strikes on Iranian nuclear facilities.
IAEA Director General Rafael Mariano Grossi has said inspectors will work on the “modalities” for returning to Iranian enrichment sites, including dates, procedures, and locations. DW reported that Grossi said inspections were “going to happen” under the interim U.S.-Iran deal, while an Iranian diplomat said access would come only after a final agreement. Reuters also reported that the IAEA chief said inspections would go ahead and that the agency was working on the details.
Why the uranium stockpile matters
The dispute is bigger than a calendar fight. If inspectors are allowed to measure and characterize Iran’s higher-enriched material before any downblending, experts say they can build a clearer chain of accountability. If Iran downblends material first and later presents the product to inspectors, the IAEA may have a harder time confirming how much 60% enriched uranium existed at the start and whether any material remained outside monitoring.
Laura Rockwood, a former IAEA negotiator on Iran, told RFE/RL that inspectors likely already have a priority list for sites and material they would want to check first. Matthew Sharp, a former U.S. National Security Council official on Iran nuclear issues, said direct measurement before downblending would give inspectors a stronger baseline. Without that, the verification gap becomes much harder to close.
A fragile deal gets a technical test
The interim agreement has already been pulled in different directions by Washington, Tehran, and the IAEA. U.S. officials have described the inspection framework as robust. Iranian officials have pushed back publicly, saying access to attacked facilities and nuclear material depends on a final deal and broader sanctions relief.
That makes the uranium issue a pressure point for the entire ceasefire and nuclear framework. A deal that looks politically viable can still fail if inspectors cannot establish what the IAEA calls “continuity of knowledge” over Iran’s nuclear material. War damage, possible unexploded ordnance, restricted access, and any movement of uranium during the conflict could all slow or complicate the process.
For now, the public fight is about whether inspections happen soon. The deeper question is whether they happen early enough, broadly enough, and with enough access to prove what Iran still has.