Prime Minister Sir Keir Starmer is due to set out a long-delayed plan to commit billions of pounds of future funding for the armed forces.
In one of his final acts as prime minister, Sir Keir is making a speech to unveil the defence investment plan (DIP), which he says will keep Britain "safe and secure long into the future".
The Ministry of Defence said the defence investment plan (DIP) includes £5bn worth of investment to increase the armed forces' use of drones and autonomous weapons.
Earlier this month, the Treasury and No 10 agreed a £13.5bn funding increase, well short of the £28bn the MoD wanted – though new Defence Secretary Dan Jarvis has pushed for more in recent weeks.
Jarvis's predecessor, John Healey, resigned earlier this month in protest at the amount that had been committed to the military.
The Conservatives said the plan was "too little, too late", while the Liberal Democrats said it "dangerously short-changed our armed forces".
The MoD has given some details of the plan:
Despite his impending departure from Downing Street, Prime Minister Sir Keir is pushing ahead with the DIP.
Tense Whitehall negotiations over how to fund it have been ongoing for months, with departments across government asked to make cuts.
The row has seen two defence ministers resign over what they said was an inadequate funding increase in the original version of the plan.
The DIP will also explain how new equipment and defence infrastructure will be funded over the coming decade.
It was initially expected to be published last autumn but now arrives before the Nato leaders summit in Turkey on 7 July.
The DIP follows the wide-ranging Strategic Defence Review (SDR), which was published in June 2025 and pledged billions in extra spending to fund a shift towards "warfighting readiness".
General Sir Richard Barrons, one of authors of SDR, told the BBC the lengthy delay to the DIP highlights "how hard the conversation has been between the MoD and the Treasury".
Sir Richard said while the publication of the DIP "does count as progress", it would not "crack the issue" defending the UK "sufficiently well and quickly".
"More has to be done sooner and that requires more money than is currently on the table," Sir Richard said.
Earlier this month, Healey quit the government, saying the DIP fell well short of what is needed to protect the UK and meet existing spending commitments, while Armed Forces Minister Al Carns resigned, saying it was not "transformative enough" in the face of rapidly-evolving warfare.
It has been reported Jarvis has secured some extra money for the plan. He has also spent the last two weeks "refocusing" the DIP to take on more of the lessons from Ukraine and Iran, the MoD said.
This includes how drones have been used to destroy high-value targets, with Jarvis saying the "character of warfare is rapidly changing".
He said: "In Ukraine and the Middle East, uncrewed systems are defining conflicts.
"This largest ever UK investment into these evolving technologies will help our armed forces stay ahead of our adversaries, backed by the best of our defence industry."
The MoD has said plans to replace ageing warship will be scrapped in favour of building at least six new modern "hybrid" vessels equipped to deploy drones.
Sir Keir said there would be "game-changing investment" to strengthen the armed forces on land, at sea and in the air.
He said: "Today's defence investment plan will help drive growth across the UK, giving our industrial base the confidence, certainty and support it needs to develop and scale the technologies that will keep our country safe and secure long into the future."
His remarks come after unions and defence firms warned the continued delays to the DIP were a "threat" to British jobs, skills and national security.
Sir Keir's decision to publish the DIP in his final weeks as prime minister could cause tension with his successor, who may want to revise defence spending when they take over.
The Sunday Times reported Andy Burnham, who is widely expected to succeed Sir Keir as prime minister next month, has seen the DIP and approved it, though No 10 declined to confirm that on Monday.
Burnham is the only candidate to have formally joined the Labour leadership race.
He has previously said he would reduce the welfare bill by getting more people into work, thereby ensuring more money for defence.
Shadow defence secretary James Cartlidge said the DIP was "being rushed through because Keir Starmer is desperate for a legacy".
He said: "This plan is not worth the paper it's written on – Keir Starmer is prime minister in name only.
"The next prime minister needs to cut welfare and give our armed forces the funding they need to keep Britain safe."
Lib Dem leader Sir Ed Davey said: "The government has dangerously short-changed our armed forces when they need urgent investment after years of Conservative negligence.
"Defence chiefs have been forced to make hard choices, when they should be given what they need."
Nato General Secretary Mark Rutte has previously urged the alliance's members to present "clear, concrete and credible plans" for how they will raise defence spending ahead of next month's summit.
The UK government has vowed to increase defence spending to 3.5% of GDP by 2035, in line with Nato commitments.
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