European leaders on Saturday welcomed U.S. President Donald Trump's plans to meet with Russian President Vladimir Putin on ending the war in Ukraine, while stressing the need to keep pressure on Moscow and protect Ukrainian and European security interests.

Trump plans to meet Putin in Alaska on August 15, saying the parties, including Ukrainian President Volodymyr Zelenskyy, were close to a deal that could resolve the 3½ year conflict.

Details of the potential deal have yet to be announced, but Trump said it would involve "some swapping of territories to the betterment of both". It could require Ukraine to surrender significant parts of its territory, an outcome Zelenskyy and his European allies say would only encourage Russian aggression.