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U.K. Defense Secretary John Healey resigned Thursday after clashing with Prime Minister Keir Starmer’s government over military spending, dealing the British leader a setback weeks before a critical NATO summit to include President Donald Trump.
Healey’s departure stemmed from a dispute over the delayed Defense Investment Plan (DIP) — the government’s long-promised roadmap for military investment and readiness — and as NATO allies face renewed pressure from Trump to boost defense spending.
“John Healey’s resignation is a seismic moment for the government and the Ministry of Defense,” Royal United Services Institute (RUSI) Senior Associate Fellow Ed Arnold told Prime Times Digital.
“For the government, it creates a sequence of political headaches in terms of a replacement, and trying to get the Defense Investment Plan published.”
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Britain’s Defence Secretary John Healey speaks with British and Norwegian naval personnel at the unveiling of the Atlantic Bastion programme in Portsmouth, Britain, on Dec. 4, 2025. (Peter Nicholls/Pool via Reuters)
Healey had been in intense, late-stage negotiations with Starmer and Chancellor of the Exchequer Rachel Reeves over the scale and timelines of the DIP.
Starmer reportedly refused to set out a timeline to reach 3.5% of gross domestic product (GDP) on defense by 2035 — a promise he made to Trump at last year’s NATO summit — and would not commit to a firm date for reaching 3%.
Instead, Starmer offered Healey a deal to spend 2.68% of GDP on defense by 2030, up only marginally from 2.6% next year, Reuters reported.
“You have been unable, and the Treasury has been unwilling, to commit the resources that the nation needs to defend the country,” Healey wrote to Starmer in his resignation letter, warning that the financial constraints would “make the country less safe,” the outlet reported.
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NATO Secretary General Mark Rutte, U.S. President Donald Trump and Britain’s Prime Minister Keir Starmer pose with NATO country leaders during the NATO Heads of State and Government summit in The Hague, Netherlands, on June 25, 2025. (Ben Stansall/Pool via Reuters)
“If the delay to the Defense Investment Plan was already undermining the government’s credibility on defense, John Healey’s resignation has blown a hole in its side,” Professor Kevin Rowlands of the RUSI defense and security think tank told Prime Times Digital.
“The immediate consequence is not just political embarrassment for No. 10, but a significant loss of planning certainty at a time when the British Armed Forces, the Ministry of Defense, and industry really need clarity on what will be funded, and when,” he added.
The political fallout is expected to reverberate across the Atlantic, where Washington has increased pressure on European allies to fulfill their defense obligations. Trump has frequently criticized NATO alliance members as “free riders.”
On June 3, Secretary of State Marco Rubio also told the House Foreign Affairs Committee that the upcoming Ankara summit would be the “most important meeting” in NATO’s history because there are some things “that need to be cleared up and fixed.”
He added, “The United States is still in the NATO alliance, and we’ll be there.”
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British Prime Minister Keir Starmer increased the military presence in Cyprus following an Iranian drone strike early Monday, Feb. 24, 2026. (Kin Cheung / POOL / AFP via Getty Images))
However, U.S. officials have made it clear that patience is wearing thin.
“Ahead of next month’s NATO summit, POTUS has been clear: Allies must fulfil their commitment to spending 5% of GDP on defense,” U.S. Ambassador to NATO Matthew Whitaker posted on X this week.
Furthermore, a U.S. official noted that a U.K. funding package far lower than 18 billion pounds ($23 billion) would send a highly “negative” signal to Trump ahead of the Ankara meeting, according to The Times.
Starmer has pledged to lift spending to 3% in the next Parliament but Healey’s exit has exposed that the current strategy leaves the U.K. lagging behind key allies. By comparison, Germany plans to spend 3.7% of its GDP on defense by 2030.
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“Healey knows the threats we face, he knows the capabilities and shortfalls the armed forces have, and if he believes that the financial settlement is not enough to keep the country safe — to the extent that he cannot honorably stay in post — then we are in trouble,” Rowlands added.
“While the impact will mainly be felt on Whitehall, the international implications are severe with a NATO summit just three weeks away,” Arnold noted.