Speaking with NATO secretary-general Mark Rutte during a meeting at the White House, the US president said: “We’ve made a deal today where we are going to be sending them weapons, and they’re going to be paying for them.

“This is billions of dollars worth of military equipment which is going to be purchased from the United States, going to NATO, and that’s going to be quickly distributed to the battlefield.”

Weapons being sent include surface-to-air Patriot missile systems and batteries, which has asked for to defend itself from Russian air strikes.

also said he was “very unhappy” with , and threatened “severe tariffs” of “about 100%” if there isn’t a deal to end the war in Ukraine within 50 days.

The White House added that the US would put “secondary sanctions” on countries that buy oil from Russia if an agreement was not reached.

Later on Monday, Ukrainian leader Volodymyr Zelenskyy thanked Mr Trump and said he was “grateful” for the US president’s “readiness to help protect our people’s lives”.

After criticising Vladimir Putin’s “desire to drag it out”, he said he appreciated “preparing a new decision on Patriots for Ukraine” – and added Kyiv is “working on major defence agreements with America”.

It comes after weeks of frustration from Mr Trump over Mr Putin’s refusal to agree to an end to the conflict, with the Russian leader telling the US president from Moscow’s goals in Ukraine at the start of the month.

During the briefing on Monday, Mr Trump said he had held calls with Mr Putin where he would think “that was a nice phone call”, but then “missiles are launched into Kyiv or some other city, and that happens three or four times”.

“I don’t want to say he’s an assassin, but he’s a tough guy,” he added.

Earlier this year, Mr Trump told Mr Zelenskyy in a fiery White House meeting, and suggested as he sought to negotiate an end to the conflict.

After Mr Trump’s briefing, Russian senator Konstantin Kosachev said on Telegram: “If this is all that Trump had in mind to say about Ukraine today, then all the steam has gone out.”

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Meanwhile, Mr Zelenskyy met with US special envoy Keith Kellogg in Kyiv, where they “discussed the path to peace” by “strengthening Ukraine’s air defence, joint production, and procurement of defence weapons in collaboration with Europe”.

He thanked both the envoy for the visit and Mr Trump “for the important signals of support and the positive decisions for both our countries”.