The developments centered on the loss of international oversight of Iran’s nuclear material, mounting restrictions and threats involving shipping through Hormuz, and a new round of regional military activity that prompted Saudi emergency alerts and high-level talks with the head of US Central Command.
IAEA warns of serious proliferation concern
The International Atomic Energy Agency has carried out no in-field verification activities in Iran for more than six months, except for an inspection of the Bushehr nuclear power plant in June, Director General Rafael Grossi said at the agency’s General Conference in Vienna.
Grossi said the IAEA withdrew its inspectors after renewed attacks on Iran in late February, worsening a decline in oversight of Tehran’s nuclear program during 2026.
The agency has also lacked continuity of knowledge for more than a year regarding Iran’s previously declared inventories of low- and highly enriched uranium, including material enriched to 60% purity, at nuclear facilities affected by attacks in June 2025.
“The Agency’s lack of information about this nuclear material and access to facilities to verify it is a matter of serious proliferation concern and needs to be addressed with the utmost urgency,” Grossi said.
He called a return to diplomacy and negotiations over Iran’s nuclear program “imperative,” warning that the situation had consequences for the wider global non-proliferation system.
The remarks came as Iran summoned Austria’s chargé d’affaires over Vienna’s failure to issue a visa to Mohammad Eslami, the head of the Atomic Energy Organization of Iran. Foreign Ministry spokesperson Esmail Baghaei called the decision “completely unjustified” and said Tehran had formally protested.
Bloomberg reported earlier that Austria denied Eslami entry after pressure from the Trump administration, preventing him from addressing the IAEA conference. A US official cited by Bloomberg said Washington had urged Austria not to grant a UN-requested sanctions waiver that would have permitted the visit.
Iran threatens restrictions against 77 vessels
Maritime tensions also escalated as Iran’s Persian Gulf Strait Authority published an updated list of 77 vessels it accused of violating Iranian protocols governing passage through the Strait of Hormuz.
The authority warned that the vessels could face restrictions on future passage, including fines, detention or confiscation. Ships cooperating with vessels on the list would also be added, it said, while companies and other entities were warned not to provide services to them.
Iran’s Foreign Ministry said Tehran would continue taking what it considered necessary measures for as long as the United States maintained its maritime blockade.
Baghaei said security in the Strait of Hormuz was a matter for Iran and Oman as the two coastal states and blamed US actions for instability in the waterway. He said an understanding between Tehran and Muscat establishing safe shipping routes had been reached after weeks of negotiations while preserving the sovereign rights of both countries.
But a wider regional meeting planned in Oman had been postponed. Baghaei said it could have provided even a small step toward dialogue between Tehran and Persian Gulf countries, describing its postponement as a missed opportunity.
“Israel is the only beneficiary of tensions between Iran and Persian Gulf countries,” he said, calling on neighboring states to set aside past disputes and pursue regional dialogue.
Saudi Arabia had sought amendments to the Omani-Iranian proposal over concerns that its language could establish an unacceptable new status quo in the strait, Axios reported, citing a senior regional official.
The United States, meanwhile, said its forces had redirected 101 commercial vessels while enforcing the blockade against Iran as of September 13.
Shipping traffic through Hormuz remained sharply reduced over the weekend. Only four commodity vessels exited the Persian Gulf and 10 entered, Reuters reported, citing preliminary tracking data. Daily traffic fell to single digits, compared with a 10-day average of 14 vessels, although the figures excluded ships operating with their tracking transponders switched off.
The IRGC also said that it had detected and destroyed an advanced MQ-1 drone over the Strait of Hormuz using a new Aerospace Force air-defense system. It did not identify the drone’s operator, and the statement was not independently verified.
Houthis claim Saudi air-base attack
Yemen’s Iran-backed Houthis said they attacked an air base in Khamis Mushait in southwestern Saudi Arabia on Monday. Saudi authorities did not immediately confirm that a strike had occurred.
Saudi Arabia’s Civil Defense initially issued emergency alerts warning of potential danger in Khamis Mushait and nearby Abha, but announced shortly afterward that the danger had passed in both locations.
Saudi Crown Prince Mohammed bin Salman met US Central Command chief Admiral Brad Cooper to discuss the latest regional developments.
Elsewhere, missiles struck three camps belonging to Iranian Kurdish opposition groups east of Sulaimaniya in Iraq’s Kurdistan region early Monday, two security sources told Reuters. No casualties were reported, and the sources did not identify who carried out the attacks.
The latest round of tensions has added to pressure on energy markets and regional shipping. Brent crude rose more than $3 to above $108 a barrel at the opening on Monday following fresh strikes on Saudi Arabia and vessels in the Persian Gulf over the weekend.
Pressure was also evident in Iran’s currency market with the US dollar trading at 2.34 million rials, the euro at about 2.7 million rials and the British pound at 3.16 million rials by around midday Monday.