Sir Keir Starmer said the UK is set to increase spending on defence, security and resilience to 5% of GDP by 2035 to meet an “era of radical uncertainty” – but without promising any additional cash.

The move – part of a new spending pledge by the NATO alliance – was panned as deceptive “smoke and mirrors” by critics, who pointed to the very real risk of escalating conflict between Iran, the US and Israel, as well as Russia’s full-scale war in Ukraine.

Volodymyr Zelenskyy told Sky News the timeline for the increase was “very slow” and warned Russia could attack a NATO country within five years.

“In my view, this is slow because we believe that starting from 2030, Putin can have significantly greater capabilities,” he told chief presenter Mark Austin.

The prime minister, Donald Trump and the other leaders of NATO’s 32 member states are expected to approve the investment goal when they meet at a summit in The Hague, which opens later today.

It replaces a previous target to spend 2% of GDP purely on defence.

The announcement will be celebrated as a win for the US president, who has been demanding his allies spend more on their own defences instead of relying on American firepower.

Overnight, he claimed to have secured another success, declaring that Iran and Israel have agreed to a ceasefire – just hours after Iran launched missiles against two American military bases in retaliation to a US decision to attack three Iranian nuclear sites over the weekend.

Perhaps it will mean he will switch attention back to achieving a goal to end Russia’s war in Ukraine, which will be another key focus of the gathering in the Dutch capital.

NATO planners have crunched the summit down to a short main session tomorrow, with a final communique much briefer than usual – all steps designed to reduce the chance of the US president leaving early.

He is already scheduled to arrive late and last this evening, provided he turns up.

There is huge nervousness about Mr Trump’s commitment to an alliance that has been the bedrock of European security since it was founded more than 75 years ago.

He is not a fan though, and has previously accused Europe and Canada of an overreliance on American firepower for their own security, calling for them to do more to defend themselves.

This pressure has arguably been a bigger motivator in prompting certain allies to agree to spend more on their militaries than the threat they say is posed by Russia, Iran, China and North Korea.

Spain’s position could create friction this week. The Spanish prime minister, while agreeing to the new investment goal, has said his country is not obliged to meet it.

The UK was also slow to say yes – a stance that was at odds with a defence review endorsed by Sir Keir that was centred around a “NATO-first” policy.

As well as agreeing to the defence and security investment goal, the British government is also publishing a new national security strategy on Tuesday that will highlight the importance of a wider definition of what constitutes security, including energy, food and borders.

There will also be a focus on a whole-of-society approach to resilience in an echo of the UK’s Cold War past.

It described the commitment to invest in defence, security and national resilience as an aligning of “national security objectives and plans for economic growth in a way not seen since 1945”.

Sir Keir said: “We must navigate this era of radical uncertainty with agility, speed and a clear-eyed sense of the national interest to deliver security for working people and keep them safe.

“That’s why I have made the commitment to spend 5% of GDP on national security. This is an opportunity to deepen our commitment to NATO and drive greater investment in the nation’s wider security and resilience.”

The funding will be split, with 3.5% of GDP going on core defence and 1.5% on homeland security and national resilience – a new and so far less clearly defined criteria.

Progress on investment will be reviewed in 2029.

The defence goal is higher than the government’s current ambition to lift defence expenditure to 3% of GDP by 2034, from 2.3% currently.

The only solid commitment is to spend 2.6% on defence by 2027 – a figure that has been boosted by the addition of the whole of the budget for the intelligence agencies.

This level of intelligence spending had not previously been included and has drawn criticism from defence experts because it is not the same as tanks, artillery and troops.

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The government, in its statement, is now focusing on an even higher-sounding number, claiming that it will hit 4.1% of the new NATO target by 2027.

However, this is merely based on adding the new 1.5% spending goal for “resilience and security” to the already stated 2.6% defence spending pledge.

A Downing Street spokesperson was unable immediately to say how much of GDP is currently spent on whatever is included in the new resilience category.

It could include pre-announced investment in civil nuclear energy as well as infrastructure projects such as roads and railways.

For the UK, 1.5% of GDP is about £40bn – a significant chunk of national income.

Sir Ben Wallace, a former Conservative defence secretary, accused the government of “spin” over its spending pledge because it does not include any new money anytime soon.

“The threat to our country is real not spin,” he told Sky News.

“This government thinks it can use smoke and mirrors to deceive the public and Donald Trump. This is an insult to our troops who will see no significant new money. It fools no one.”