Trump's Iran Ultimatum Collides With UK Base Limits
Trump's 48-hour deadline to obliterate Iran's power plants expires Monday, but British base restrictions may block the strike — exposing a widening gap between Washington's rhetoric and allied reality.
A 48-hour clock is running out. President Trump's deadline to "obliterate" Iran's power plants expires Monday night, but U.S. forces may lack permission to launch the strike from the very bases built to project that power.
The United Kingdom authorized U.S. forces to use RAF Fairford and Diego Garcia only for defensive operations against Iranian missile sites targeting ships in the Strait of Hormuz. UK government sources confirmed London has not granted permission for attacks on civilian infrastructure, including power plants — drawing a hard line between defense and the kind of offensive action Trump demanded on Truth Social Saturday evening.
"Our approach to this conflict has been the same throughout," UK Foreign Secretary Yvette Cooper told Al Jazeera Sunday. "We were not and continue not to be involved in offensive action."
Trump issued the ultimatum after a day of Iranian missile strikes on southern Israeli towns wounded more than 170 people. The injuries were still raw when he posted the threat.
"If Iran doesn't FULLY OPEN, WITHOUT THREAT, the Strait of Hormuz, within 48 HOURS from this exact point in time, the United States of America will hit and obliterate their various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!" Trump wrote.
The deadline expires Monday at approximately 23:44 GMT.
Britain's refusal to permit strikes on civilian infrastructure creates a direct strategic dilemma for the Pentagon. Diego Garcia, a remote Indian Ocean island jointly operated by the U.S. and UK, serves as a staging point for defensive operations — but UK authorization covers only missile site strikes and defensive purposes. The island sits 2,360 miles from Iran, a distance that already exceeds the 1,240-mile range previously assessed for Iranian ballistic missiles.
Iran proved Sunday it had closed that gap. Its attempted strike on Diego Garcia demonstrated new missile capabilities, though neither warhead reached the target: one failed in flight, the other was intercepted by a U.S. warship. The attack underscored that British territories are now within Tehran's reach.
Iranian officials wasted no time raising the stakes further.
"Immediately after the targeting of power plants and infrastructure in our country, vital infrastructure and energy and oil infrastructure throughout the region will be considered legitimate targets and will be destroyed in an irreversible manner," Iranian Parliament Speaker Mohammad Bagher Ghalibaf posted on X Sunday.
The threat reaches beyond military installations and into the lives of millions. Eighty percent of the United Arab Emirates' water supply — and 100 percent of Qatar's and Bahrain's — depends on desalination facilities that Iranian retaliation could shutter. Iranian Foreign Minister Abbas Araghchi compounded the pressure on London directly, warning that Britain's base agreement made the UK a "participant in aggression" subject to Iranian self-defense.
Markets absorbed the tension long before Monday's deadline. Brent crude climbed to $112.19 per barrel Friday, up 70 percent year-to-date, as the effective closure of the Strait of Hormuz choked global shipping for nearly three weeks. At the pump, American families paid 93 cents more per gallon. The International Energy Agency released 400 million barrels from strategic reserves in response; the U.S. Treasury granted a 30-day waiver allowing the sale of Iranian oil already loaded onto tankers.
Europe has watched from the sidelines. Germany, Italy, and Greece explicitly refused to send warships to reopen the strait, drawing Trump's rebuke — he called NATO allies "cowards." The Pentagon, meanwhile, requested $200 billion in supplemental war funding from Congress and deployed thousands of additional Marines to the region.
Analysts see the ultimatum as a pressure tactic unlikely to shift Iranian calculations. "I think this is the result of lack of planning and the fact that the Trump administration didn't foresee the response from the Iranian side," said Aniseh Bassiri Tabrizi, associate fellow at Chatham House. "But the threats are not likely to have any impact."
Treasury Secretary Scott Bessent offered a different read Sunday on Meet the Press: "Sometimes you have to escalate to de-escalate."
When the clock runs out Monday night, the answer will be clear — either Washington moves alone, constrained by the decisions of allies it cannot command, or the world's most powerful military stands at the edge of its own ultimatum, unable to act.