Starmer Blocks U.S. Bid to Use UK Bases for Possible Iran Strike

British Prime Minister Keir Starmer has reportedly rejected a request from U.S. President Donald Trump to allow American forces to use key British air bases for any potential preemptive military strike against Iran, citing concerns over international law.

According to The Times of London, which first disclosed the development, Starmer denied U.S. access to RAF Fairford in England and the joint UK-U.S. facility at Diego Garcia in the Indian Ocean.

The two bases have long served as strategic staging posts for American military operations abroad, with Diego Garcia playing a critical role in hosting the U.S. heavy bomber fleet.

British media reports, including those by the BBC, The Guardian, and The Telegraph, cited government sources as saying that permitting such use could amount to a breach of international law.

The concern, sources said, is that states offering logistical or operational support with knowledge of an unlawful act could be considered complicit.

The UK Ministry of Defence declined to comment on what it described as operational matters. However, a government spokesperson emphasized Britain’s support for diplomatic engagement between Washington and Tehran.

“There is a political process ongoing between the U.S. and Iran, which the UK supports. Iran must never be able to develop a nuclear weapon, and our priority is security in the region,” the spokesperson said.

Under long-standing bilateral arrangements, U.S. requests to use British military facilities are assessed on a case-by-case basis.

Veterans Minister Al Carns recently reiterated that approvals are subject to legal and policy considerations, in written responses to parliamentary inquiries.

The diplomatic tension comes amid broader discussions between the two leaders. Starmer and Trump held a telephone conversation earlier this week, with official readouts indicating that Middle East and European security were among the issues discussed.

The following day, Trump publicly criticized a separate UK decision regarding sovereignty over the Chagos Islands, home to the strategically vital Naval Support Facility Diego Garcia.

Britain had agreed to transfer sovereignty of the archipelago to Mauritius under a deal that would lease back the military base for 99 years.

In a post on his Truth Social platform, Trump described Starmer’s approach as “a big mistake,” asserting that control over the island was being compromised.

His comments appeared to diverge from a prior U.S. State Department statement expressing support for the UK’s agreement with Mauritius.

White House Press Secretary Karoline Leavitt later clarified that Trump’s social media statement should be regarded as official administration policy.

Trump also underscored the potential military value of Diego Garcia and RAF Fairford, stating that access to the facilities could be necessary in the event of action against what he described as a “dangerous regime” in Tehran.

Military analysts note that while neither base was used in last year’s limited U.S. B-2 bomber operation targeting Iranian nuclear facilities, any prolonged campaign could increase the strategic importance of forward operating bases.

Operating heavy bombers such as the B-2, B-1, and B-52 from locations closer to Iran would significantly reduce turnaround times for refuelling and rearming.

However, basing such aircraft within closer range of Iranian territory could also expose them to potential retaliatory missile strikes, adding another layer of strategic calculation to the unfolding transatlantic dispute.

The White House has not issued an official response to the British reports.