Iran live updates: US blockade of Iran's Strait of Hormuz ports to begin Monday

British Prime Minister Keir Starmer said in a statement on Monday that the U.K. will not take part in President Donald Trump's planned blockade of Iranian ports in the Strait of Hormuz, which is due to begin on Monday.

"We're not supporting the blockade," Starmer told BBC radio in an interview Monday morning, while declining to say whether the U.K. was sending minesweeper vessels to the Strait, as Trump indicated in an interview with Fox News.

"We do have mine-sweeping capability, I won't go into operational matters, but we do have that capability -- that's all focused, from our point of view, on getting the Strait fully open," Starmer said.

He reiterated his position that the U.K. will not join the conflict. "The UK is not getting dragged in," Starmer said. "That's not in our national interest, because I'm not going to act unless there's a clear, lawful basis and a clear thought-through plan."

French President Emmanuel Macron said in a Monday post to X that the U.K. and France are coordinating on a "peaceful multinational mission" to keep the Strait of Hormuz open to maritime traffic "as soon as circumstances permit."

The two countries will host a conference "in the coming days" Macron said.

"This strictly defensive mission, separate from the warring parties to the conflict, is intended to be deployed as soon as circumstances permit," Macron wrote. "No effort must be spared to swiftly reach, through diplomatic means, a strong and lasting settlement to the conflict in the Middle East."

The spokesperson for Iran's joint military command at Khatam al-Anbiya Central Headquarters said Monday that if the security of Iranian ports in the Persian Gulf and the Sea of Oman is threatened, "no port in the Persian Gulf and the Sea of Oman will be safe."

"Enemy-affiliated" vessels will not have the right to pass through the Strait of Hormuz, while other vessels will continue to be allowed transit "in accordance with the regulations of the Islamic Republic of Iran's armed forces," the spokesperson said, as quoted by Iran's state television Telegram channel.

"Given the continued threats," he said, the Islamic Republic will also implement "a permanent mechanism" to control the Strait of Hormuz, even after the war.

The price of oil again climbed on Monday, after the United States said it would begin a blockade of the Strait of Hormuz.

The blockade -- which was expected to begin at 10 a.m. ET, according to U.S. Central Command -- appeared poised to continue the disruption of the vital maritime passageway off the southern Iranian coast, through which some 20% of the world's oil supply is shipped.

Brent crude oil prices, a benchmark for global trading, climbed about 8% by 5 a.m. ET on Monday. It traded at more than $102 a barrel for deliveries in June.

U.S. crude prices for May contracts also advanced about 8% in early trading, climbing to about $103 per barrel.

U.S. forces will begin a blockade of maritime traffic to and from Iranian ports Monday morning, according to U.S. Central Command.

"U.S. Central Command (CENTCOM) forces will begin implementing a blockade of all maritime traffic entering and exiting Iranian ports on April 13 at 10 a.m. ET, in accordance with the President's proclamation," according to a CENTCOM statement late Sunday afternoon.

Guided-missile destroyer USS Frank E. Petersen Jr. (DDG 121) sails in the Arabian Sea during Operation Epic Fury, on March 18, 2026.
U.S. Navy
"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," the statement continued, adding that CENTCOM forces "will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports."

President Donald Trump said Sunday morning in a post on his social media platform that the U.S. will "immediately" begin a blockade of the Strait of Hormuz, following the failure of peace negotiations between the U.S. and Iran.

Commercial mariners will be provided with additional information prior to the start of the blockade, according to CENTCOM, which also advised "all mariners" to monitor advisory broadcasts and contact U.S. naval forces "when operating in the Gulf of Oman and Strait of Hormuz approaches."