Ukrainian President Volodymyr Zelenskyy and U.S. envoys arrived in Berlin on Sunday for another round of peace talks, with Kyiv emphasizing that strong security guarantees are an essential component of any prospective deal to end the war.

Zelenskyy said there will be “meetings in Berlin today and tomorrow” to discuss the proposals on the table to find an end to the conflict in Ukraine. Zelenskyy said he will meet personally with U.S. President Donald Trump’s special envoy Steve Witkoff and Trump’s son-in-law Jared Kushner in Berlin.

Ukrainian, U.S. and European officials will hold a series of meetings in Berlin, Zelenskyy said. But the exact timing and scope of the talks haven’t been disclosed. Delegations will be meeting on Sunday, according to media reports, followed by a summit on Monday that will include U.K. Prime Minister Keir Starmer, French President Emmanuel Macron and German Chancellor Friedrich Merz.

“The summit in Berlin is important: we are meeting with both the Americans and the Europeans,” Zelenskyy told journalists in a WhatsApp group chat on Sunday, according to a transcript of his remarks. “It is important for us. And believe me, we have done a lot to ensure that these parties all meet together.”

Zelenskyy emphasized the need for Ukraine to receive firm guarantees from the United States and European allies that would be similar to those offered to NATO members, according to the transcript of the group chat.

“These security guarantees are an opportunity to prevent another wave of Russian aggression,” the Ukrainian leader said. “And this is already a compromise on our part.”

Zelenskyy emphasized that the security guarantees would need to be legally binding and supported by the U.S. Congress. He said he expected an update from his team following a meeting between Ukrainian and U.S. military officials in Stuttgart.

“Most importantly, I will be meeting with envoys of President Trump, and there will also be meetings with our European partners, with many leaders, concerning the foundation of peace — a political agreement to end the war,” Zelenskyy said in an address late Saturday.

Merz this week said Germany is inviting Washington to join a meeting in Berlin to discuss Ukraine. But whether Washington joins will “very much depend” on progress in negotiations “over the weekend” on the underlying documents, he added.

The chancellor’s spokesperson, Stefan Kornelius, said separately that “numerous European heads of state and government, as well as the leaders of the EU and NATO, will join the talks,” which will follow the meeting of the German, French and U.K. leaders in Berlin.

The talks in Berlin are to discuss the latest version of a 20-point peace plan brokered by the U.S. just days after Ukraine sent its revised version to Washington. The plan proposes a demilitarized “free economic zone” in the Donbas region where American business interests could operate.

A major sticking point in the negotiations is the fate of territory in eastern Ukraine, which Kyiv refuses to cede after Moscow’s occupation. European leaders are racing to assert their relevance in the process amid concerns that Washington’s proposals lean toward Russia and put demands on Ukraine that Zelenskyy will not be able to accept.