Ukrainian President Volodymyr Zelenskyy, who is seeking a meeting with U.S. President Donald Trump, said on Tuesday that at least 200,000 European peacekeepers would be needed to prevent a new Russian attack after any ceasefire deal.

The Ukrainian leader, speaking at the World Economic Forum in Davos, Switzerland a day after Trump returned to power following months of promises to end the war in Ukraine quickly, also urged European leaders to do more to defend the continent.

The prospect of a rapid settlement has focused minds in Kyiv and Europe on the urgent need for security guarantees to prevent any future Russian attack, with the idea of peacekeeping force circulating.

"From all the Europeans? 200,000, it's a minimum. It's a minimum, otherwise it's nothing," Zelenskyy said when asked about the idea of a peacekeeping contingent on an interview panel after delivering his speech.

That number is around the size of the entire French armed forces, estimated at just over 200,000 by France's defense ministry in 2020. Zelenskyy said at least that number would be needed as a security guarantee if Russia's armed forces totaled 1.5 million personnel and Ukraine had only half that number.

Zelenskyy said such a force would only be part of the security guarantees that Ukraine needed.

The Ukrainian leader said Kyiv was working to set up a meeting between himself and Trump.

"The teams have been working on a meeting, they are currently in the process," Zelenskyy said about those efforts.

Trump, who returned to office on Monday, has said he would stop the war in Ukraine swiftly, without saying how.

Zelenskyy said Ukraine would not agree to Russian demands that it drastically reduce the size of its military, predicting that Russian President Vladimir Putin would demand Ukraine cut its armed forces to a fifth of their size.

"This is what he wants. We will not allow this to happen," Zelenskyy said.

In his speech, Zelenskyy said Europe must make itself a strong global player, able to guarantee peace and security for itself and for others. He suggested Europe had less influence over Washington because the United States viewed its allies' contribution to security as lacking.

"Does anyone in the United States worry that Europe might abandon them someday – might stop being their ally? The answer is no," Zelenskyy said.

He said that Europeans needed to devise a united security and defense policy and alluded to a pre-inauguration remark by Trump, who proposed a massive hike in defense spending for NATO members to 5% of GDP.

"If it takes 5% of GDP to cover defense, then so be it, 5% it is. And there is no need to play with people's emotions that defense should be compensated at the expense of medicine or pensions – that's not fair," Zelenskyy said.