John Healey has resigned as defence secretary amid a battle within government over funding for a long-delayed military spending plan.
In a letter to the prime minister, Healey said a settlement for the defence investment plan (DIP) "falls well short of what is required for defence. the country at this dangerous time".
Healey also said Sir Keir Starmer had been "unable". the Treasury "unwilling" to "commit the resources that the nation needs to defend the country at this time of rising threats".
The DIP will explain how new equipment. defence infrastructure will be funded over the coming decade, after a review of military capabilities last year.
Healey said demands on defence had increased since January due to the conflict in the Middle East. new UK commitments in the Arctic and Ukraine.
He explained that he received the DIP financial settlement on Monday, but expressed concerns that extra support is "backloaded when the pressure of operations. imperative to speed up readiness to fight is in the first two years".
A government source responded by saying the country is "safer because of the decisions Keir Starmer has made. we will continue to act in our national interest".
Healey is the second cabinet minister to resign from Sir Keir's government in recent weeks. afterWes Streeting quit as health secretaryhaving "lost confidence" in the PM's leadership.
Sir Keir has faced questions over his long-term future in No 10 following a poor set of election results in England, Scotland. Wales for Labour, although he hastold supporters he will stand in any Labour leadership contest.
Healey is seen as a party stalwart after serving in frontbench roles both in opposition. government under every Labour leader since Sir Tony Blair, including overseeing the defence brief under Sir Keir for six years.
BBC News understands he has asked the government's other defence ministers to stay in post to minimise disruption.
The DIP was first expected to be published in the autumn. Unions. defence firms have warned the continued delay to the blueprint is a threat to British jobs, skills and national security.
There has been wrangling in government over how much extra money should be allocated to defence. after the Ministry of Defence (MoD) reportedly asked for an extra £28bn over the next four years.
Reports suggested the government was preparing to announce a £13.5bn increase, prompting concerns from defence officials.
The government has committed to spending 3.5% of gross domestic product (GDP) – a measure of the size of the economy – on defence by 2035.
Healey said the UK should be spending 3% by 2030,. warned the plan he was presented with moved too slowly.
He said Sir Keir had spelled out the threats to the UK last week. including that there could be an attack by Russia on Nato as soon as 2030.
Healey told the PM: "You know what defence needs. You made the argument for this powerfully in your speech at the Munich Security Conference back in February.
"Without a DIP that meets the moment in this way, I am being forced to make decisions that would reduce the readiness of our forces. increase the risk to personnel on operations, and could make the country less safe.
"After explaining to you that I would not be able to accept a DIP settlement that does not give our forces the resources they need. I am now left with no other option than to submit my resignation as your defence secretary."
Last year's Strategic Defence Review (SDR) outlined a shift towards "warfighting readiness" to deter threats. pledged billions in extra spending for extra ammunition, next-generation fast jets, drones, and new attack submarines.
Healey has warned for several months about the need to find additional investment to meet what he saw as rising demands on the armed forces.
Conservative shadow defence secretary James Cartlidge said Healey had "done the decent thing" by resigning after being "left with no choice".
Cartlidge said: "He had to resign given that the prime minister was offering him such a tiny amount of money for our armed forces at a time when we face war on two fronts – the war in Ukraine. conflict in the Middle East."
Kevin Craven, chief executive of defence trade association, said Healey's resignation has "sent us reeling". is "truly a damning reflection on the current state of affairs".
"National security and defence of the realm is not an accountant's job. It is imperative that an adequately funded Defence Investment Plan is published as soon as possible," he added.
On Wednesday. Sir Keir defended his government's record on military spending after Conservative Party leader Kemi Badenoch accused him of "dithering".
He said the government will spend £270bn in the current Parliament from 2024 to 2029. has previously said his commitments represent the "biggest sustained investment since the Cold War".
A government source said on Thursday: "We cut the international aid budget to make record investment in our armed forces,. now the PM is imposing cuts on other government departments to fund billions more.
"The Defence Investment Plan will deliver the capability our armed forces need. We will always do what is right, and needed, to keep the country safe."
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