Touching on Ukrainian anxieties that a direct meeting between Mr. Trump and Putin could marginalize Kyiv and European interests, Zelenskyy said: "Any decisions that are without Ukraine are at the same time decisions against peace. They will not bring anything. These are dead decisions. They will never work."

The talks in the UK came just a day after Trump announced the face-to-face meeting with Putin set for Aug. 15 in Alaska to continue negotiations to end the war that has dragged on for more than three years.

Ukraine’s President Volodymyr Zelenskyy defiantly declared Saturday that his countrymen “will not give their land to occupiers,” after President Donald Trump suggested that a peace deal would include some “swapping” of territories with Russia.