The United States has ordered a full maritime blockade on traffic entering and exiting Iranian ports, marking a sharp escalation in regional tensions. The measure takes effect at 10:00 a.m. ET on April 13, 2026, under a presidential proclamation, according to details released by U.S. Central Command on April 12.
The directive gives U.S. forces authority to control access along Iran’s coastline and halt the movement of goods and military supplies.
In the early phase of operations, U.S. Navy Arleigh Burke-class guided missile destroyers have already been deployed to enforce control and secure key waterways.
Ships, including USS Frank E. Peterson and USS Michael Murphy, are operating in the Arabian Gulf and the Strait of Hormuz, forming a visible frontline presence. These destroyers are supported by aircraft and surveillance systems, allowing the U.S. to monitor and intercept vessels approaching Iranian ports.
Expanding control over strategic sea routes
The blockade applies to vessels of all nationalities operating near Iranian ports and within territorial waters. However, the United States has clarified that freedom of navigation through the Strait of Hormuz will continue for ships traveling to non-Iranian destinations.
This approach is designed to isolate Iran’s maritime activity without disrupting one of the world’s busiest oil transit routes.
By targeting port access, Washington aims to pressure Iran’s economy and reduce its ability to move resources and military equipment.
Key ports such as Bandar Abbas, Bushehr, and Chabahar are central to Iran’s trade and naval operations. Restricting these hubs directly affects both commercial exports and military logistics.
Layered naval force backs blockade
The enforcement effort relies on a multi-layered maritime system led by U.S. Naval Forces Central Command and the Fifth Fleet. Destroyers equipped with the Aegis Combat System provide air and missile defense while coordinating surface operations. Carrier-based aircraft extend surveillance and strike capability across wide areas.
P 8A Poseidon maritime patrol aircraft are conducting continuous intelligence and tracking missions. These aircraft help identify vessels and monitor movement across the Gulf. Unmanned systems are also being used to improve awareness in crowded coastal waters.
At the same time, mine countermeasure ships and underwater systems are being deployed due to the growing risk of naval mines.
President Donald Trump reinforced the move in a public statement after negotiations failed. “So, there you have it, the meeting went well, most points were agreed to, but the only point that really mattered, NUCLEAR, was not,” he said.
“Effective immediately, the United States Navy, the Finest in the World, will begin the process of BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz.”
Mine threats complicate operations
The Strait of Hormuz presents major operational challenges for mine clearance. At its narrowest point, the waterway is about 24 miles wide, with shipping lanes much tighter. This forces commercial traffic into predictable paths, increasing vulnerability. Shallow waters, strong currents, and heavy sediment make detecting mines difficult.
Iran is believed to use irregular mine placement strategies rather than fixed patterns. Mines may be scattered across large areas using small boats or covert methods. This creates uncertainty and slows clearance operations. Forces must treat every detected object as a potential threat, increasing the time required to secure safe routes.
Different types of mines add to the complexity. These include contact mines that explode on impact, influence mines triggered by sound or pressure, and bottom mines that are hard to detect in sediment. Drifting mines and manually attached limpet mines also pose risks.
Phased approach to secure safe passage
U.S. operations are focusing on a phased strategy. Initial efforts aim to establish control and identify threats. This is followed by detailed seabed surveys using unmanned underwater vehicles such as the Mk 18 systems. These tools help locate and classify mine-like objects with high precision.
Instead of clearing the entire area at once, forces are creating verified safe corridors for ships. This allows commercial traffic to resume under controlled conditions while broader clearance continues.
Allied navies are expected to support these efforts with specialized mine-hunting vessels and systems.