But prospects for progress are uncertain: The Trump administration’s focus is shifting to Venezuela while U.S. suggestions of a Greenland takeover are causing tension with Europe, and Moscow shows no signs of budging from its demands in its nearly 4-year-old invasion.

Before the U.S. capture of Venezuelan leader Nicolás Maduro, French President Emmanuel Macron had expressed optimism about the latest gathering of what has been dubbed the “coalition of the willing. They have been exploring for months how to deter any future Russian aggression should it agree to stop fighting Ukraine.

In a Dec. 31 address, Macron said that allies would “make concrete commitments” at the meeting “to protect Ukraine and ensure a just and lasting peace.”

Macron’s office said an unprecedented number of officials will attend in person, with 35 participants including 27 heads of state and government. The U.S. envoys, Steve Witkoff and Trump’s son-in-law Jared Kushner, met with Macron at the Elysee presidential palace for preparatory talks ahead of the gathering.

Moscow has revealed few details of its stance in the U.S.-led peace negotiations. Officials have reaffirmed Russia’s demands and have insisted there can be no ceasefire until a comprehensive settlement is agreed. The Kremlin has ruled out any deployment of troops from NATO countries on Ukrainian soil.

A series of meetings on the summit’s sidelines illustrated the intensity of the diplomatic effort and the complexity of its moving parts.

Ukrainian President Volodymyr Zelenskyy arrived for a meeting with Macron ahead of the summit.

French, British and Ukrainian military chiefs also met, with NATO’s top commander, U.S. Gen. Alexus G. Grynkewich, taking part, for talks that France’s army chief said focused on how to implement security guarantees. Army chiefs from other coalition nations joined by video.

A news conference including Zelenskyy, Macron, British Prime Minister Keir Starmer and German Chancellor Friedrich Merz was planned later in the day.

Macron’s office said the U.S. delegation was initially set to be led by Secretary of State Marco Rubio, but he changed his plans after the U.S. military intervention in Venezuela.

Tension rises over Greenland comments

Trump on Sunday renewed his call for the U.S. to take control of Greenland, a strategic, mineral-rich Arctic island.

The leaders of France, Germany, Italy, Poland, Spain and the U.K. on Tuesday joined Danish Prime Minister Mette Frederiksen in defending Greenland’s sovereignty in the wake of Trump’s comments about the self-governing territory of the kingdom of Denmark.

But the continent also needs U.S. military might to back up Ukrainian security guarantees and ward off Russia’s territorial ambitions. That could require a delicate diplomatic balancing act in Paris.

Participants are seeking concrete outcomes on five key priorities once fighting ends: ways to monitor a ceasefire; support for Ukraine’s armed forces; deployment of a multinational force on land, at sea and in the air; commitments in case of more Russian aggression; and long-term defense cooperation with Ukraine.

But whether that’s still achievable Tuesday isn’t so clear now, after the U.S. military operation targeting Maduro in Venezuela.

Ukraine seeks firm guarantees from Washington of military and other support seen as crucial to securing similar commitments from other allies. Kyiv has been wary of any ceasefire that it fears could provide time for Russia to regroup and attack again.

Recent progress in talks

Witkoff had indicated progress in talks about protecting and reassuring Ukraine. In a Dec. 31 post, he said “productive” discussions with him, Rubio and Kushner on the U.S. side and, on the other, national security advisers of Britain, France, Germany and Ukraine had focused on “strengthening security guarantees and developing effective deconfliction mechanisms to help end the war and ensure it does not restart.”

France, which with the U.K. has coordinated the multinational effort to shore up a possible peace plan, has given only broad-brush details about its scope. It says Ukraine’s first line of defense against a Russian resumption of war would be the Ukrainian military and that the coalition intends to strengthen it with training, weaponry and other support.

Macron has also spoken of European forces potentially being deployed away from Ukraine’s front lines to help deter future Russian aggression.

Important details unfinalized

Zelenskyy said during the weekend that potential European troop deployments still face hurdles, important details have not been finalized, and “not everyone is ready” to commit forces.

He noted that many countries would need approval from their lawmakers even if leaders agreed on military support for Ukraine. But he recognized that support could come in forms other than troops, such as “through weapons, technologies and intelligence.”

Zelenskyy said deployments in Ukraine by Britain and France, Western Europe’s only nuclear-armed nations, would be “essential.”

“Speaking frankly as president, even the very existence of the coalition depends on whether certain countries are ready to step up their presence,” he said. “If they are not ready at all, then it is not really a ‘coalition of the willing.’”

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Volodymyr Yurchuk in Kyiv, Ukraine, contributed.