The UK is ready to spend “well over” £100m on a possible deployment of British forces to Ukraine if Donald Trump secures a peace deal with Russia, the defence secretary has said.

John Healey also said Vladimir Putin views Britain as his “number one enemy” because of the country’s support for Ukraine.

The defence secretary’s plan includes the preparation of military personnel to join a multinational force that would be sent to help secure Ukraine’s borders if the US president brokers a ceasefire between Moscow and Kyiv.

He signalled British troops could be ready to deploy as soon as that happened and he said this could include soldiers on the ground.

Some of the anticipated money to prepare for any mission is already being spent.

The defence secretary also warned of a “new era of threat” and said the risk of wider conflict in Europe has not been as great since the end of the Second World War.

Mr Healey used a lecture at Mansion House in London to talk about efforts led by the UK and France to build a “coalition of the willing” of more than 30 nations to form what he called a “Multinational Force Ukraine” over the past six months.

This force would help to secure Ukraine’s skies and seas and train its troops if Russia agrees to halt its full-scale war.

“So, as President Trump leads the push for peace here in Europe, we are ready to lead the work to secure it in the long-term,” the defence secretary said.

“For our Armed Forces, I am already reviewing readiness levels and accelerating millions of pounds of funding to prepare for any possible deployment into Ukraine.”

Asked how much money, he said it would be “well over” £100m.

Mr Healey trumpeted the UK’s support for Ukraine, including a record £4.5bn in assistance this year, and taking over from the United States in co-chairing a wider group of nations that have been sending weapons and money to Kyiv.

“This is why President [Volodymyr] Zelenskyy calls the UK his closest ally,” he said.

“This is why Putin ranks Britain as his number one enemy.”

But he warned that as Russia’s aggression grew in Ukraine and beyond its borders, “Britain and our NATO allies stand more unified, and stronger”.

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Giving a stark verdict of the security landscape, Mr Healey said: “This is – undeniably – a new era of threat. The world is more unstable, more uncertain, more dangerous. Not since the end of the Second World War has Europe’s security been at such risk of state-on-state conflict.”

He said this required what he described as “a new era for defence”.

He said: “This is now an age for hard power, strong alliances and sure diplomacy.”

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The defence secretary said plans for the new era would include increasing defence spending to 5% of GDP by 2035 – though critics have accused the UK and other European allies of playing smoke and mirrors with the target, questioning how much will really be spent on weapons and troops.

“As I look ahead to the rest of this decade, our task, in this new age of hard power is to secure peace in our continent and to forge stronger deterrence and resilience, a New Deal for European security,” said Mr Healey.

Turning to the Middle East, he also announced the UK was sending a two-star military officer to work as the deputy to the US commander, charged with monitoring the ceasefire between Israel and Hamas.