Prime Minister Sir Keir Starmer has pledged to meet a new Nato target to spend 5% of the UK's GDP on national security by 2035.
At a Nato summit in the Netherlands, 32 member countries including the UK are expected to agree the 5% goal, with 3.5% to go on core defence and the remaining 1.5% on defence-related areas such as resilience and security.
The split target is aimed at placating US President Donald Trump, who has urged Nato allies to spend more, while giving cash-strapped EU countries flexibility over how they meet the target.
Downing Street has argued measures on energy and tackling smuggling gangs could be classified as security spending.
The Conservatives said the plan was unfunded and a decade away.
