# Iran Declares Strait of Hormuz ‘Closed’ Unless U.S. Meets Demands, Raising Global Shipping Risks

*Wednesday, September 23, 2026 at 4:08 PM UTC — Hamer Intelligence Services Desk*

**Published**: 2026-09-23T16:08:22.138Z (2h ago)
**Category**: geopolitics | **Region**: Middle East
**Importance**: 10/10
**Sources**: OSINT
**Permalink**: https://hamerintel.com/data/articles/18646.md
**Source**: https://hamerintel.com/summaries

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**Deck**: Iran’s Supreme National Security Council secretary says negotiations are over and the Strait of Hormuz will remain closed indefinitely unless the U.S. ends what Tehran calls aggressive actions, lifts sanctions, and releases frozen assets, turning a long standoff into a direct challenge to maritime traffic and energy importers.

Iran has shifted from hinting at pressure in the Strait of Hormuz to openly declaring that the waterway will stay closed on its terms unless the United States yields on core issues.

According to statements from Iran’s Supreme National Security Council (SNSC) secretary, negotiations are “over,” and the Strait will remain closed indefinitely unless Washington ends what Tehran calls aggressive actions, including a naval blockade and economic “terrorism” in the form of sanctions. The SNSC secretary also listed conditions including a ceasefire on all fronts, the release of frozen or restricted Iranian assets, and acceptance of safe shipping lanes to be agreed between the coastal states.

These remarks come amid reports of Iranian fire on commercial ships near Hormuz and claims that Iranian anti-ship missiles hit the UAE-owned cargo vessel MV Cape Dao in the Strait, killing one crew member described as an Indian national. Together, they suggest Iran is prepared to back its political demands with force in one of the world’s most important maritime corridors.

Iran’s president Masoud Pezeshkian has used his speech at the UN General Assembly in New York to argue that Iran will not accept a situation where some states have unrestricted use of Hormuz while others are constrained. He has said Iran will not accept “free access” to Hormuz for some while others face restrictions, and that Tehran does not want insecurity in the Strait but also cannot allow the waterway to be used to impose aggression or deny Iran its own rights.

For global shipping, the implications are immediate. Hormuz is the route for a large share of Gulf oil and gas exports that power economies from Asia to Europe. If Iran continues to treat the Strait as a lever in its confrontation with Washington, ship operators may be forced to weigh holding outside the area, rerouting, or sailing through a zone where missiles, drones, and fast boats are declared tools of pressure rather than background risks.

Energy markets have already reacted to rising tensions. Oil prices have climbed back above $100 a barrel as traders cite Middle East supply risks alongside surging diesel prices. Freight markets have seen oil tanker costs hit record levels of around $1.2 million per day on some routes as war with Iran disrupts shipping and insurers demand a premium for transits linked to Hormuz.

Tehran frames its position as defensive. Pezeshkian has said Iran has built defensive systems so that bombing of Iranian cities will not go unanswered, and that Iran does not seek anyone’s permission to defend itself. At the same time, he has said Iran is ready for dialogue, diplomacy, and negotiations, but not under what he calls the language of force.

For states that depend on Gulf energy flows, especially in Asia and Europe, the greater danger may be a prolonged period of uncertainty rather than a single dramatic blockade. Hormuz does not have to be sealed off entirely to change behaviour. A handful of missile strikes, seizures, or harassment incidents can be enough for major shippers and insurers to raise costs or reduce exposure.

Signals to watch now include whether Iran moves from rhetoric to more systematic interference with shipping, whether regional states such as Oman and the UAE adjust their own naval and coast guard deployments, whether the United States organizes expanded escort operations, and whether any back-channel contacts resume despite the public declaration from Iran’s SNSC that negotiations are over.