Resignation exposes deep Labour divisions over Britain’s security strategy as global threats intensify

John Healey has resigned as UK defence secretary after a bitter dispute with Prime Minister Keir Starmer over military spending, accusing the government of failing to provide the resources needed to keep Britain safe at a time of rising international danger.

The resignation marks one of the most serious ruptures inside Starmer’s government since Labour entered office, turning a long-running debate over defence funding into a full-blown political crisis. Healey’s departure comes amid mounting pressure on European governments to increase military readiness in response to Russia’s war in Ukraine, instability in the Middle East, growing threats to maritime security and uncertainty over the future direction of US foreign policy.

In his resignation letter, Healey argued that the government’s defence investment plans fell short of what was required for the new security environment. He warned that Britain could not credibly claim to be strengthening national defence while delaying the level of spending needed to rebuild military capacity, improve readiness and meet growing operational commitments.

At the heart of the dispute is the pace of the UK’s military spending increase. Starmer has pledged to raise defence spending over the coming years, but Healey believed the timetable was too slow and the funding too limited. According to reports, the government’s latest plan would raise defence spending to about 2.68% of GDP by 2030, while Healey had pushed for a more ambitious target of 3% within the same period.

The disagreement reflects a broader dilemma facing the government. Starmer and Chancellor Rachel Reeves are trying to balance defence demands with pressure on public finances, stretched public services and a difficult economic backdrop. But Healey’s resignation suggests that, inside the Ministry of Defence, there was growing frustration that financial caution was overriding strategic necessity.

For Healey, the issue was not simply political. It was about whether Britain’s armed forces were being asked to do more without being given the resources to match the government’s ambitions. The UK remains a key NATO member, a major supporter of Ukraine and an important European military power. But defence analysts and former military chiefs have repeatedly warned that the armed forces need urgent investment after years of pressure on personnel, equipment and procurement.

The timing is especially damaging for Starmer. The resignation comes before major international discussions on defence and security, when Britain is expected to reassure allies that it remains committed to NATO and European security. Instead, the prime minister now faces questions about whether his government’s defence policy is credible and whether Labour is united on national security.

Opposition parties are likely to seize on the resignation as evidence that Starmer’s promises on defence are not being matched by action. Conservatives will argue that Labour cannot be trusted to protect the country, while critics within Labour may see Healey’s departure as a sign of deeper unease over the government’s priorities.

The resignation also puts pressure on whoever succeeds Healey. The next defence secretary will inherit not only a demanding brief but also a politically exposed funding plan. They will need to reassure the armed forces, NATO partners and the defence industry that the government remains serious about rebuilding Britain’s military strength.

For Starmer, the immediate challenge is to prevent the resignation from becoming a wider crisis of authority. Healey was regarded as a serious and experienced figure, not an impulsive rebel. His decision to quit gives weight to the accusation that the government is underestimating the scale of the security challenge facing the UK.

The dispute reveals a central tension in British politics: national security is becoming more expensive at precisely the moment public finances are under strain. The question is no longer whether Britain should spend more on defence, but how quickly it can do so — and what risks it accepts if it waits.

Healey’s resignation has turned that question into a defining test for Starmer. At a time of war in Europe, instability across the Middle East and growing pressure on NATO, the prime minister must now convince both his party and Britain’s allies that his government’s defence commitments are more than words.