Is Iran Closing the Persian Gulf to U.S. Warships?
WANA (Aug 09) – According to some media reports, Iran has committed, within the framework of an agreement with Oman regarding the reopening of the Strait of Hormuz, to prevent U.S. warships from passing through the waterway.
Controlling the entrance route to the Strait of Hormuz would effectively mean cutting off U.S. naval access to the Persian Gulf. Under the principle of “innocent passage,” Iran argues that U.S. naval forces represent a security threat and therefore would not be permitted to freely transit the strait.
When the United States deployed its Fifth Fleet to Bahrain in 1983, the objective was not only to protect oil tankers. Washington sought to establish a strategic reality: the Persian Gulf should remain a region where the U.S. Navy could move freely, deploy forces, and intervene if necessary.
USS Abraham Lincoln. Social media /WANA News Agency
Now, more than four decades later, Iran is attempting to challenge that equation by restricting access to the Strait of Hormuz and seeking to reshape the rules of passage — not by attacking a warship or laying naval mines, but by changing the framework governing maritime movement.
The central issue in a potential Iran-Oman agreement is not the number of oil tankers passing through the Strait of Hormuz. The real question is whether, for the first time, the entry of foreign military vessels into the Persian Gulf could become subject to rules in which Iran plays a decisive role in defining the terms.
If such a shift becomes established, Tehran would move from being viewed as a “threat to energy routes” to becoming a “rule-setter for the security architecture of energy routes” — a transformation that would matter to Washington far more than a temporary disruption in tanker traffic.
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A Legal Battle With Military Consequences
At first glance, the dispute appears to be a technical issue in maritime law: determining the exact legal status of the Strait of Hormuz entrance route and which international rules apply to vessels passing through it.
But behind this legal debate lies a military question: Does a U.S. warship have the same right of passage as a commercial oil tanker?
The principle of “innocent passage” under maritime law allows foreign vessels to transit through the territorial waters of states. However, the issue of warships has long been disputed among countries. Some states, including Iran, argue that the passage of military vessels requires prior coordination and authorization, while the United States rejects such restrictions.
For this reason, changing the legal status of the Strait of Hormuz entrance route goes beyond maritime mapping or technical navigation issues; it could directly affect the future of U.S. military operations in the region.
People walk past a billboard with a graphic design about the Strait of Hormuz on a building, amid a ceasefire between U.S. and Iran, in Tehran, Iran, April 27, 2026. Majid Asgaripour/WANA (West Asia News Agency)
Why Is This More Important to the Pentagon Than Oil?
Because from Washington’s perspective, Hormuz is not merely an energy corridor — it is a military corridor.
A significant part of U.S. naval operations in the region, from the movement of equipment, fuel, and logistical support to the deployment of combat vessels, depends on maintaining unrestricted access to the Persian Gulf.
Therefore, limiting the freedom of movement of the U.S. Navy at the entrance of this waterway — even without completely halting commercial shipping — could increase the operational costs of Washington’s military presence in the region.
For the United States, the issue is not simply whether an oil tanker can pass through Hormuz. The question is whether American warships can continue entering the Persian Gulf without coordination with coastal states, as they have done for decades.
Members of the Iranian Army take part in an annual drill in the coastal area of the Gulf of Oman and near the Strait of Hormuz, Iran, in this picture obtained on December 30, 2022. Iranian Army/WANA (West Asia News Agency)
The End of the Era of “Unrestricted U.S. Presence”?
The current competition is no longer only between U.S. warships and Iran’s military capabilities. It is increasingly a contest between two different security models.
The first model relies on the permanent presence of external powers to guarantee regional security. The second argues that security in the Persian Gulf should be managed by the coastal states themselves through regional arrangements.
If implemented, an Iran-Oman agreement could become part of this broader transformation: shifting the focus of Persian Gulf security from “who has the larger military presence?” to “who determines the rules of access and presence?”
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For years, the threat of closing the Strait of Hormuz has been Iran’s most important deterrence tool — a measure that would carry significant economic and political costs if used.
The emerging strategy, however, appears to follow a different path: instead of closing the route, Iran seeks to influence and control the rules governing it.
In that scenario, Tehran would no longer create a crisis simply by restricting access; it would become part of a new regional order by shaping the rules of maritime passage.
And the United States would no longer be able to view the Persian Gulf as a region where access depends solely on Washington’s decisions. A new era would begin in which coastal states set conditions for the presence of foreign military powers.
