Prime Minister Keir Starmer is under increasing political pressure after a dramatic shake-up at the top of the Ministry of Defence, with Defence Secretary John Healey resigning and Armed Forces Minister Al Carns later following him out of government.

The resignations have sparked intense debate over the government's proposed Defence Investment Plan, which is expected to shape Britain's military spending priorities for years to come.

Healey reportedly stepped down after expressing concerns that the plan did not provide sufficient funding to strengthen the UK's armed forces amid growing international security challenges. His departure has triggered fresh questions about the government's commitment to defence spending at a time of heightened geopolitical uncertainty.

The political fallout has quickly become one of the biggest challenges facing Starmer's premiership.

The controversy centres on a long-awaited defence strategy designed to modernise Britain's military capabilities, strengthen national security and support the domestic defence industry. While government ministers insist the plan represents a significant increase in defence investment, critics argue that it falls short of what is needed to meet future threats.

Following Healey's resignation, Al Carns also resigned from his ministerial position, deepening concerns about divisions within government over defence policy.

The government has moved swiftly to restore stability, appointing Dan Jarvis as the new Defence Secretary. Jarvis now faces the immediate challenge of reassuring military leaders, defence industry stakeholders and international allies that Britain remains committed to strengthening its armed forces.

The timing of the resignations is particularly sensitive as NATO allies prepare for major discussions on defence spending and collective security.

Government ministers have rejected suggestions that defence policy is in disarray, insisting that the Defence Investment Plan is still being finalised and that work continues to ensure it delivers both military capability and economic benefits.

Supporters of greater defence spending argue that ongoing conflicts, technological developments and emerging security threats require sustained investment in equipment, personnel and military infrastructure.

Political analysts say the dispute has exposed wider tensions over government spending priorities and could become a defining issue in Westminster over the coming months.

The crisis has also fuelled debate about Britain's long-term strategic position, with growing calls from defence experts for clearer commitments on future military funding.

As pressure mounts, attention will now focus on whether the revised defence strategy can restore confidence within government, reassure Britain's allies and address concerns raised by departing ministers.

With the NATO summit approaching and scrutiny intensifying from both Parliament and the public, the government's next moves on defence spending could have significant political and national security consequences.