European leaders will convene in London on Sunday for high-level talks with Ukrainian President Volodymyr Zelensky, following a turbulent White House meeting that has further strained U.S.-Ukrainian relations.

British Prime Minister Keir Starmer will host the summit, with his office stating that he aims to “intensify efforts in pursuit of a just and lasting peace in Ukraine.”

Speaking with BBC News on Sunday morning, Starmer revealed that he had coordinated with U.S. President Donald Trump and French President Emmanuel Macron to develop a joint UK-France peace plan for Ukraine. The proposal will later be presented to the U.S. and potentially involve “one or two” other nations working toward a ceasefire.

Zelensky arrived in the UK on Saturday, fresh from a contentious visit to Washington, D.C., where his Oval Office meeting with Trump and U.S. Vice President JD Vance devolved into a heated public confrontation.

During the meeting, Trump and Vance criticized Zelensky, falsely blaming Ukraine for initiating the war with Russia—despite the conflict beginning with Moscow’s invasion in February 2022. They also voiced frustration over a stalled minerals extraction deal and accused Kyiv of reluctance to engage in peace negotiations with Russian President Vladimir Putin.

In response, European leaders swiftly reaffirmed their support for Ukraine, though several stressed the need for Kyiv to maintain strong diplomatic ties with Washington.

“The prime minister has reiterated his unwavering support for Ukraine and is determined to find a way forward that ends Russia’s illegal war while ensuring Ukraine’s sovereignty and long-term security,” Starmer’s office stated.

Starmer spoke with both Zelensky and Trump on Friday evening, shortly after the Ukrainian delegation’s fraught White House visit, which concluded with the abrupt cancellation of a planned press conference and Zelensky’s team being asked to leave.

Sunday’s summit in London will include leaders from Germany, France, Denmark, Italy, the Netherlands, Norway, Poland, Spain, Turkey, Finland, Sweden, Czechia, and Romania. Additionally, NATO’s secretary-general and the presidents of the European Commission and European Council are expected to participate.

Despite efforts to broker peace, Zelensky cautioned that any ceasefire without concrete security guarantees would be “dangerous for Ukraine.”

“All Ukrainians want to hear a strong U.S. position on our side,” he stated. “It’s understandable that the U.S. may seek dialogue with [Russian President Vladimir] Putin, but the U.S. has always spoken about ‘peace through strength.’ Together, we can take strong steps against Putin.”

Meanwhile, in Russia, Kremlin spokesperson Maria Zakharova dismissed Zelensky’s Washington trip as a “complete diplomatic failure” and accused him of being “obsessed” with prolonging the war. She reiterated Moscow’s insistence on annexing all Ukrainian territories currently under Russian occupation.

With tensions mounting, Sunday’s summit is expected to shape the next phase of international diplomacy on Ukraine, as European leaders seek a path forward amid growing uncertainty over U.S. support.