BRUSSELS — The European Union faces a critical week as it seeks to shield Ukraine from a humiliating peace deal carved out by the U.S. and Russia while attempting to salvage an agreement to fund a multi-billion euro loan to keep Kyiv afloat.

After a series of stinging attacks from Washington ― including Donald Trump telling POLITICO that European leaders are “weak” ― the coming days will be a real test of their mettle. On Monday leaders will attempt to build bridges and use their powers of persuasion over the peace agreement when they meet Ukraine President Volodymyr Zelenskyy and U.S. officials in Berlin. At the same time in Brussels, EU foreign ministers and diplomats will battle to win over a growing number of European governments that oppose the loan plan.

By Thursday, when all 27 leaders gather in the Belgian capital for what promises to be one of the most pivotal summits in years, they’ll hope to have more clarity on whether the intense diplomacy has paid off. With Trump’s stinging put-downs ― Europe’s leaders “talk, but they don’t produce” ― and NATO chief Mark Rutte’s stark warnings about the the threat from Russia ringing in their ears, they’re taking nothing for granted.

“We are Russia’s next target, and we are already in harm’s way,” Rutte said last week. “Russia has brought war back to Europe and we must be prepared for the scale of war our grandparents and great grandparents endured.”

Little wonder then that European officials are casting the next few days as existential. The latest shot of 11th-hour diplomacy will see the leaders of the U.K., Germany and possibly France, potentially with Trump’s son-in-law Jared Kushner and his special envoy Steve Witkoff, meeting with Zelenskyy in Berlin.

As if to underscore the significance of the meeting, “numerous European heads of state and government, as well as the leaders of the EU and NATO, will join the talks” after the initial discussion, said Stefan Kornelius, spokesperson for German Chancellor Friedrich Merz. French President Emmanuel Macron hasn’t confirmed his attendance but spoke to Zelenskyy by telephone on Sunday.

The discussion will represent Europe’s attempt to influence the final settlement, weeks after a 28-point peace plan drafted by Witkoff  — reportedly with the aid of several Kremlin officials — provoked a furious backlash in both Kyiv and European capitals. They’ve since scrambled to put together an alternative.

Further European disunity this week would send a “disastrous signal to Ukraine,” said one EU official. That outcome wouldn’t just be a hammer blow to the war-struck nation, the official added: “It’s also fair to say that Europe will then fail as well.”

Emptying territories

This time the focus will be on a 20-point amendment to the plan drafted by Kyiv and its European allies and submitted to Washington for review last week.

The contents remain unclear, and nothing is decided, but the fate of the Ukrainian territories under Russian occupation is particularly thorny. Trump has pitched emptying out the territories of Ukrainian and Russian troops and establishing a demilitarized “free economic zone” where U.S. business interests could operate.

Ukraine has rejected that proposal, according to a French official, who was granted anonymity because of the sensitivity of the negotiations.

The U.S. has insisted on territorial concessions despite fierce European objections, the official added, creating friction with the Trump administration.

Europe’s leaders insist there can be no progress on territory before Ukraine is offered security guarantees.

In a sign of movement toward some kind of deal, Zelenskyy said over the weekend he was willing to “compromise” and not demand NATO membership for Ukraine. Instead, the country should be afforded an ad-hoc collective defense arrangement, he told journalists in a WhatsApp conversation.

“The bilateral security guarantees between Ukraine and the United States … and the security guarantees from our European colleagues for us, as well as from other countries such as Canada and Japan ― these security guarantees for us provide an opportunity to prevent another outbreak of Russian aggression,” he said.

Repeated setbacks

Europe will have further opportunities to discuss the way forward after Monday. EU affairs ministers will continue on Tuesday in Brussels to thrash out plans for Thursday’s summit. In between, Wednesday will see the leaders of Europe’s “Eastern flank” ― with countries including the Baltics and Poland represented ― huddle in Helsinki.

The EU has been trying for months to convince Belgian Prime Minister Bart De Wever to consent to a plan to use the cash value of the €185 billion in Russian state assets held in Brussels-based depository Euroclear to fund and arm Ukraine. (The remainder of the total €210 billion financial package would include €25 billion in frozen Russian assets held across the bloc.)

In a sign the chances of a deal at Thursday’s summit are worsening rather than improving, Italy — the EU’s third-largest country — sided with Belgium’s demands to look for alternative options to finance Ukraine in a letter on Friday that was also signed by Malta and Bulgaria.

Czechia’s new Prime Minister Andrej Babiš also rejected the plan on Sunday.

“The more such cases we have the more likely it is that we will have to find other solutions,” an EU diplomat said.

The five countries — even if joined by pro-Kremlin Hungary and Slovakia — would not be able to build a blocking minority, but their public criticism erodes the Commission’s hopes of striking a political deal this week.

A meeting of EU ambassadors originally planned for Sunday evening was postponed until Monday.

While the last-minute diplomatic effort has left many concerned the money might not be approved before the end of the year, with Ukraine in desperate need of the cash, three diplomats insisted they were sticking to the plan and that no alternatives were yet being considered.

Belgium is engaging constructively with the draft measures, actively making suggestions and changes in the document to be considered when ambassadors meet on Monday, one of the diplomats and an EU official said.

The decision on the Russian assets is “a decision on the future of Europe and will determine whether the EU is still a relevant actor,” a German official said. “There is no option B.”

Bjarke Smith-Meyer, Nick Vinocur, Victor Jack and Zoya Sheftalovich in Brussels, Veronika Melkozerova in Kyiv, Clea Caulcutt and Laura Kayali in Paris and Nette Nöstlinger in Berlin contributed to this report.