US President Donald Trump's administration is seeking the participation of other countries to form an international coalition to restore freedom of navigation in the Strait of Hormuz, according to a US State Department cable seen by Reuters.

US Secretary of State Marco Rubio approved the creation of the Maritime Freedom Construct (MFC), the cable dated April 28 said, which it described as a joint initiative by the US State Department and the Pentagon.

"The MFC constitutes a critical first step in the establishment of a post-conflict maritime security architecture for the Middle East. This framework is essential to ensuring long-term energy security, protecting critical maritime infrastructure, and maintaining navigational rights and freedoms in vital sea lanes," the cable said.

The component of the initiative led by the US State Department would serve as the diplomatic hub between partner countries and the shipping industry, while the Pentagon component operating out of US Central Command (CENTCOM) headquarters in Florida would coordinate real-time maritime traffic and communicate directly with vessels transiting the Strait, the cable said.

The story was first reported by the Wall Street Journal on Wednesday.

Drone view of oil tanker HELGA berthed at one of Iraq's southern offshore oil terminals near Basra as it prepares to load crude oil, becoming the second vessel to arrive since the closure of the Strait of Hormuz, April 24, 2026
Drone view of oil tanker HELGA berthed at one of Iraq's southern offshore oil terminals near Basra as it prepares to load crude oil, becoming the second vessel to arrive since the closure of the Strait of Hormuz, April 24, 2026 (credit: REUTERS/Mohammed Aty)

Offer to be delivered only to US allies

US embassies should deliver the demarche orally to partner nations by May 1, but not to Russia, China, Belarus, Cuba, and "other US adversaries," said the cable.

Participation could be in the form of diplomacy, information sharing, sanctions enforcement, naval presence, or other forms of support, it said.

"We welcome all levels of engagement and do not expect your country to shift naval assets and resources away from existing regional maritime constructs and organizations," the cable said.

"The MFC is distinct from the President’s Maximum Pressure campaign and from ongoing negotiations."

Traffic through the strait, which used to carry one-fifth of the world's oil and gas, has slowed to a trickle since the start of Operations Epic Fury and Roaring Lion on February 28, and Tehran's blockade of the waterway.

The proposal from the US follows a deadlock in efforts to resolve the conflict, which has also led the United States to try to squeeze Iran's oil exports with a naval blockade of Iran's ports.