President Donald Trump’s national security adviser said Sunday that top administration officials will meet with European officials this week about how to end the war in Ukraine, nearly three years after Russia launched an all-out invasion.

Less than a day earlier, the New York Post reported that Trump had a phone call with Russian leader Vladimir Putin to discuss steps toward a negotiated solution. There was no immediate confirmation from the White House or the Kremlin. National Security Adviser Mike Waltz declined to comment in a television interview.

Waltz said the Russian economy is not doing well, and Trump “is prepared to tax, to tariff, to sanction” Moscow to get Putin to the negotiating table.

But Waltz also underscored that the Trump administration is looking to use this week’s engagements to begin talks on clawing back some of the United States’ assistance to Ukraine. He said European allies will also need to take a greater role in supporting Ukraine going forward.

“We need to recoup those costs and that is going to be a partnership with the Ukrainians in terms of their natural resources and their oil and gas, and also buying ours,” Waltz said in an appearance on NBC’s “Meet the Press.”

“Those conversations are going to happen this week. And I think an underlying principle here is that the Europeans have to own this conflict going forward. President Trump is going to end it. And then in terms of security guarantees, that is squarely going to be with the Europeans.”

Vice President JD Vance will be in Paris on Monday for a summit on artificial intelligence that’s gathering government officials. Later in the week he will head to the Munich Security Conference, where Ukrainian President Volodymyr Zelenskyy will lead the battle-weary country’s delegation.

Secretary of State Marco Rubio, Defense Secretary Pete Hegseth and Trump’s special envoy on Ukraine and Russia, Keith Kellogg, also will be in Munich.

On Wednesday, Hegseth will join the main international forum for drumming up weapons and ammunition for Ukraine. He’s set to participate in a meeting of NATO defense ministers in Brussels the following day.

Putin is closer to achieving his objectives in battle-weary Ukraine, with little incentive to come to the negotiating table no matter how much Trump might cajole or threaten him, according to Russian and Western experts.

Putin previously said Trump was “clever and pragmatic,” and even parroted his false claims of having won the 2020 election. Trump’s opening gambit was to call Putin “smart” and to threaten Russia with tariffs and oil price cuts, which the Kremlin brushed off.

Trump indicated that the U.S. is talking to Russia about Ukraine without Kyiv’s input. That would run counter to Zelenskyy’s call of “Nothing about Ukraine without Ukraine.”

The Ukrainian leader has suggested that any deal reached without Kyiv’s input would send the dangerous signal to authoritarian leaders in China, North Korea and Iran that adventurism pays.