European leaders met in London to formulate a plan to help end the war in Ukraine. But even potential peacekeepers face political and economic hurdles.

European leaders sought to assemble what Britain called a “coalition of the willing” to secure Ukraine after any US-brokered ceasefire, as they gathered in London to coordinate defense spending hikes amid concerns of an American pullback.

"Not every nation will feel able to contribute," British Prime Minister Sir Keir Starmer said during a press conference on Sunday.

Pro-Ukraine protests have taken place across the US after Donald Trump and JD Vance's angry exchange with Volodymr Zelensky at the White House. Hundreds of people gathered in New York, Los Angeles and Boston to express their support for Ukraine after the furious row in the Oval Office.

An angry White House clash between Ukrainian President Volodymyr Zelenskiy and Donald Trump divided the U.S. president's fellow Republicans and dimmed prospects that Congress will approve any further aid for Kyiv in its war with Russia.

President Donald Trump will deliver a national address before Congress this week that is expected to touch on a number of key national security issues, including Pentagon reforms and the ongoing war in Ukraine.