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By Steve Mollman
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U.S. Central Command (CENTCOM) on Sunday released new details on how the United States will enforce a maritime blockade of Iran, after President Donald Trump announced the move earlier in the day following the collapse of ceasefire talks with Tehran.
In a statement posted on X, CENTCOM said U.S. forces will begin implementing a blockade of all maritime traffic entering and exiting Iranian ports on April 13 at 10 a.m. ET, acting under a presidential proclamation. The command emphasized that the operation would be narrowly focused on Iranian ports and coastal areas, while allowing international shipping to continue transiting the Strait of Hormuz so long as vessels are not bound for Iran.
The clarification addressed concerns about a wider shutdown of one of the world’s most critical energy corridors.
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Why It Matters
The Strait of Hormuz is a vital chokepoint for global energy markets, with a significant share of the world’s oil and liquefied natural gas shipments passing through the narrow waterway. Any disruption has the potential to send energy prices sharply higher and destabilize already volatile global markets.
By stating that U.S. forces “will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports,” CENTCOM signaled that the blockade is designed to apply pressure on Tehran without triggering a broader commercial shipping crisis or cutting off traffic between third countries.
What to Know
CENTCOM said the blockade will apply to all vessels of all nationalities entering or departing Iranian ports and coastal areas, including ports on the Arabian Gulf and the Gulf of Oman. The command stressed that enforcement would be impartial, regardless of a ship’s flag or country of origin.
At the same time, CENTCOM made clear that the operation does not amount to a blanket closure of nearby international waters. Commercial vessels traveling through the Strait of Hormuz to non-Iranian destinations will be allowed to pass unimpeded.
The military said additional guidance will be provided to commercial mariners through a formal notice ahead of the blockade’s start. Mariners were advised to monitor Notice to Mariners broadcasts and contact U.S. naval forces on bridge‑to‑bridge channel 16 while operating near the approaches to the Strait of Hormuz and the Gulf of Oman.
The naval blockade of Iran will test whether U.S. naval dominance can overcome Iran’s asymmetric approach, which is designed not to defeat American forces directly but to make shipping so dangerous that traffic slows or stops on its own. With drones, mines, fast boats, and land-based missiles, Iran can continue disrupting commerce even after losing most of its large ships.
Retired General Jack Keane, a former Army vice chief of staff, wrote in a New York Post column earlier this month that cutting off Iran’s oil exports through a blockade could exert decisive economic pressure without requiring a prolonged military campaign.
Rebecca Grant, a national security analyst at the Lexington Institute, told Just the News on Saturday that U.S. forces already have the surveillance and interdiction capability to monitor and control ship movements through the Strait of Hormuz, allowing Washington to screen or stop vessels passing through key choke points.
A blockade on Iran's ports would also make it more difficult for other countries to send weapons to the nation. On Sunday, Trump warned any nation caught sending weapons to Iran—including China—would be hit with a 50% tariff.
What Happens Next
U.S. naval forces are expected to begin direct engagement with mariners entering the enforcement zone as the operation gets underway on Monday, while Washington closely watches regional reactions and compliance once the blockade goes live.
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