President Donald Trump’s decision to reinstate a maritime blockade against Iranian ports opens a new chapter in the confrontation between Washington and Tehran, placing the Strait of Hormuz again at the center of a crisis with implications that go beyond direct military clashes. The move aims to prevent maritime trade with the Islamic Republic, increase economic pressure on the Iranian regime, and, according to the White House, protect one of the world’s most important energy routes.
The U.S. Central Command (CENTCOM) announced that its naval forces will resume the naval blockade of vessels entering or leaving Iranian ports, an operation that had been in effect from April 13 to June 18 before being suspended after the ceasefire agreement signed by both sides.
Although described as a “naval blockade,” the measure does not involve physically closing the Strait of Hormuz or completely halting commercial navigation in the Persian Gulf. Its aim is more specific: to prevent commercial vessels from conducting trade with Iran through a system of surveillance, interception, and rerouting of ships managed by the U.S. Navy.
In practice, any vessel with an Iranian port as origin or destination can be identified, intercepted, and ordered to change course. If the captain complies, the ship continues on its route; if not, the United States warns it may immobilize the vessel through military operations.
At the same time, Washington says other commercial traffic will continue to receive protection to transit the region, and it has asked all mariners to stay in contact with U.S. naval forces when approaching the Gulf of Oman and the approaches to the Strait of Hormuz.
The distinction between blocking Iranian ports and closing the Strait of Hormuz is key to understanding the measure’s scope. Hormuz remains an international maritime corridor open to vessels of different countries. However, almost all of Iran’s major ports in the Persian Gulf rely on that passage to connect with international trade, so controlling access to those terminals exerts significant pressure on Iran’s economy without completely preventing global navigation.
The reinstatement of the maritime blockade follows Donald Trump’s declaration that the memorandum of understanding reached in June was void, arguing that Iran continued to attack merchant vessels near the Strait of Hormuz despite committing to reduce hostilities. The move coincides with an intensification of U.S. military operations.
Over the weekend, U.S. forces reported striking roughly 140 Iranian military targets using combat aircraft, drones, and warships. CENTCOM also confirmed the first operational use of maritime drones to destroy a maintenance facility for submarines and vessels at Bandar Abbas, Iran’s main military port and a strategic enclave on the Strait of Hormuz.
Tehran responded by raising the rhetorical and operational stakes. Army spokesman Brigadier General Mohamad Akraminia said the Armed Forces “will not yield an inch” over the Strait of Hormuz and asserted that the waterway “will never be reopened through war, aggression, or U.S. attacks.” The Islamic Revolutionary Guard Corps reiterated that the closure of the strait will remain in place while U.S. intervention continues and warned that any attempt to change that situation will receive a military response.
At the same time, Iran has stepped up attacks on vessels navigating near the Strait of Hormuz and launched missiles and drones against U.S. bases and countries allied with Washington, including Bahrain, Qatar, Kuwait, the United Arab Emirates, Jordan, and Oman, expanding the conflict’s regional reach.
The new U.S. offensive also revives a strategy used during the first phase of the maritime blockade. Between April and June, CENTCOM said it diverted more than 140 vessels that complied with orders, disabled nine ships that violated the blockade, and allowed the passage of over 50 commercial vessels carrying humanitarian aid.
Beyond its military dimension, the reinstatement of the naval blockade has a significant economic component. Shipping companies that continue to operate with Iran will face a higher risk of interception, while marine insurance and shipping costs could rise if tensions continue to escalate.
The strategic importance of the Strait of Hormuz explains market concerns. Before the war, about one fifth of the world’s traded oil passed through that corridor daily. Although the United States insists international navigation will remain open for ships that do not trade with Iran, any military incident in the area can disrupt energy supply chains and put upward pressure on global oil prices.
There is an additional source of uncertainty: Donald Trump announced that the United States will begin charging a fee equivalent to 20% of the cargo’s value to ships that request U.S. protection to cross the Strait of Hormuz. If implemented, the initiative would not only increase maritime trade costs but also reinforce Washington’s role as security guarantor for one of the globe’s most strategic sea lanes — a role Iran rejects outright and one that risks prolonging the confrontation in the Persian Gulf.