Breaking news: U.N. nuclear watchdog chief Rafael Mariano Grossi said Wednesday that International Atomic Energy Agency inspectors are expected to visit Iranian nuclear enrichment sites, adding a new and potentially decisive test for the fragile U.S.-Iran interim deal.
The Associated Press reported that Grossi, speaking from the Fukushima Daiichi nuclear power plant in Japan, said the memorandum of understanding signed by the U.S. and Iranian presidents explicitly places relevant nuclear activities under IAEA supervision. Asked about the timing, Grossi said the inspection issue was not optional: “This is going to happen.”
The statement matters because Iran and the United States have offered sharply different public accounts of what Tehran has accepted. CBS News reported that President Donald Trump said Iran had “completely agreed” to nuclear inspections, while Tehran denied making such a commitment and said no inspection schedule had been set.
What changed
Until now, the inspection dispute had been framed largely through U.S. and Iranian statements. Grossi’s comments put the IAEA directly into the center of the deal’s enforcement question. According to AP, the agency has been blocked by Tehran from visiting enrichment sites since Israel’s 12-day war with Iran in 2025.
AP also reported that the IAEA is viewed as central to determining the status of Iran’s nuclear stockpile. The interim agreement is supposed to include supervision of Iran’s nuclear material facilities and downblending of enriched uranium from highly enriched levels.
Why it matters
The inspection fight is not a technical side issue. It is one of the pillars that will determine whether the 60-day diplomatic window can hold. If inspectors gain meaningful access, the deal gets a verification mechanism. If access stalls, the agreement risks becoming another paper commitment with no clear way to prove what is happening inside Iran’s nuclear program.
The stakes are high because Iran has enriched uranium up to 60% purity while insisting its program is peaceful. Western governments have long argued that verification is essential because that level is far above what is needed for civilian nuclear power.
The deal is still under pressure
The nuclear inspection dispute is unfolding alongside wider regional friction. The Guardian reported that Secretary of State Marco Rubio arrived in the Gulf to reassure U.S. allies and said Washington would not allow Iran to charge tolls or fees for shipping through the Strait of Hormuz. Rubio called the strait an international waterway and said freedom of navigation remained a U.S. priority.
The Guardian also reported that Gulf allies remain uneasy about the ceasefire deal, including the release of frozen Iranian assets, unresolved missile limits, and the risk that conflict involving Iranian-backed groups could disrupt negotiations.
What to watch next
The next major question is whether the IAEA receives actual access to the enrichment sites, not just political assurances. Grossi did not give an exact date, saying inspections could happen in days or more than a week, but he made clear that the agency considers them built into the agreement.
If inspectors arrive, the deal enters a harder verification phase. If Iran blocks or narrows access, Washington and Tehran will face a new public test just days into the ceasefire period.
Sources: Associated Press, CBS News, The Guardian.