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(TNND) — UK Prime Minister Keir Starmer announced on Monday that he will bring together dozens of countries this week with French President Emmanuel Macron to hold a summit in efforts to reopen the Strait of Hormuz and end the U.S.-Israeli war with Iran.

Starmer said the ongoing closure of the strait "is deeply damaging" and "getting global shipping moving is vital to ease cost of living pressures."

"The UK has convened more than 40 nations who share our aim to restore freedom of navigation," Starmer wrote on X ahead of a news conference. "This week the UK and France will co-host a summit to advance work on a coordinated, independent, multinational plan to safeguard international shipping when the conflict ends."

Speaking after meetings with Gulf leaders, Starmer emphasized that regional partners view the crisis with urgency, particularly following what he described as Iran’s “indiscriminate” attacks on countries that did not seek the conflict, causing civilian casualties and damage to infrastructure. He added that while the current ceasefire is welcome, it remains “highly fragile,” with the region still on edge and significant work needed to de-escalate tensions and safely reopen the strait.

The prime minister said the planned summit would focus on both diplomatic pressure to secure a lasting ceasefire and military planning to reassure commercial shipping once conditions stabilize, stressing that the effort is about protecting global trade rather than escalating the conflict.

Starmer told BBC Radio 5 Live that the UK would not be involved in enforcing the U.S. military blockade, reiterating that Britain has stayed out of direct fighting and will continue to do so, acting instead in its national interest to restore stability and freedom of navigation.

President Donald Trump announced the U.S. would begin blocking ships after 21 hours of talks with Iran failed to secure a lasting peace deal to end hostilities in the Middle East.

“It’s going to be all or none, and that’s the way it is,” Trump said as he noted the goal was to ensure all ships could transit. He did not provide explicit details on how the blockade would be carried out.

Trump was later asked whether the goal of the blockade was to reopen the strait and lower gas prices or to force Iran back to negotiations.

“I mean, both of those things, certainly. And more,” he said. “We can’t let a country blackmail or extort the world they’re really blackmailing the world and we’re not going to let that happen.”

U.S. Central Command later confirmed its forces would enforce the blockade of all maritime traffic entering and exiting Iranian ports beginning at 10 a.m. on Monday.

"The blockade will be enforced impartially against vessels of all nations entering or departing Iranian ports and coastal areas, including all Iranian ports on the Arabian Gulf and Gulf of Oman," CENTCOM said. "CENTCOM forces will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports," officials added.

Trump, pointing to early signs of movement, said 34 ships passed through the strait on Sunday—the highest number since what he called the “foolish” closure began.

Starmer also noted the economic consequences of the disruption, saying instability in the Strait of Hormuz is already contributing to rising costs and broader global economic strain. He said the UK is working with allies and industry to develop a credible plan to restore safe passage, warning that shipping companies will not return to the route until security is assured.

Trump warned on Truth Social Monday morning that if any of Iran's ships come close to the U.S. blockade, "they will be immediately ELIMINATED, using the same system of kill that we use against the drug dealers on boats at Sea."

He has sought to control the strategic waterway throughout the conflict, which handles roughly 20% of global oil shipments, a key source of leverage for Iran.