US Enforces Full Blockade on Iranian Ports, Halting All Seaborne Trade

Global oil prices surged above $100 a barrel as fears of prolonged energy disruption took hold. The U.S. Navy's enforcement of a blockade on all Iranian ports and coastal areas has stopped maritime traffic in and out of the country, cutting off a trade route that carries roughly one-fifth of the world's seaborne oil and petroleum products. This development comes amid a fragile two-week ceasefire in the U.S.-Israel-Iran conflict that began with strikes on Iranian nuclear and military sites February 28, 2026.

U.S. Central Command announced late Tuesday that the operation, involving more than 10,000 sailors, Marines and Air Force personnel, a dozen warships, and over 100 aircraft, had "completely halted" economic trade by sea within 36 hours of starting at 10 a.m. EDT Monday. CENTCOM Commander Adm. Brad Cooper stated that six merchant vessels turned back in the first day after being ordered to return to Iranian ports, with no ships making it past the blockade. Reuters separately reported a U.S. destroyer intercepting two oil tankers that had departed Chabahar port. The measures target vessels of all nations entering or leaving Iranian ports, though CENTCOM has said non-Iranian transit through the Strait of Hormuz remains possible after inspection and that humanitarian shipments may proceed under safeguards.

The blockade followed the collapse of U.S.-Iran talks hosted in Pakistan, where disagreements centered on Iran's nuclear program. Vice President JD Vance, who led the American side, said Tehran rejected demands for a verifiable end to uranium enrichment and any path to nuclear weapons. Iran, which insists on its right to enrich under the Nuclear Non-Proliferation Treaty, viewed the U.S. position as unacceptable. President Trump announced the naval action after those talks broke down, stating the pressure was intended to secure a "grand bargain" and that he sought full Iranian capitulation on key issues. One Iranian analyst told Al Jazeera the move violated the ceasefire and risked complicating a still-fragile truce, while another source cited by Reuters noted back-channel progress on narrowing gaps over sanctions relief and nuclear material removal.

Oil markets reacted with an initial spike before easing on signals that talks might resume in Pakistan within days. Trump told reporters he expected "an amazing two days ahead" and suggested a deal could allow Iran to "rebuild" under a changed regime. Estimates from the Foundation for Defense of Democracies placed potential daily losses to Iran at $435 million. The Congressional Research Service has long noted the Strait of Hormuz's role in 20-21 percent of global petroleum liquids trade and 20 percent of liquefied natural gas. Iran had sharply restricted traffic in the strait after the February strikes, driving up prices and prompting the current U.S. response. Casualty figures remain imprecise and vary by source, with reports citing thousands dead across Iran, Lebanon and coalition forces since fighting began.

Iranian officials have called the blockade "piracy" and warned of strong responses, though no immediate military escalation was reported in the first 48 hours. Critics of the policy, including some former U.S. officials, argue it risks alienating regional partners and undermining diplomacy. Supporters point to Reagan-era operations in the 1980s Gulf as precedent for decisive action limiting casualties and restoring shipping lanes. As of publication, independent verification of a total, permanent halt remained limited; some social media and video reports suggested possible evasions on day two, though these could not be corroborated by major wire services or satellite data in real time. The central tension now pits intensified economic isolation against the narrow window for renewed talks before the ceasefire expires April 21.