The calls come ahead of a scheduled meeting between Trump and Russian President Vladimir Putin on ending the war in Ukraine in Alaska on Friday. Trump has said the parties to the war were close to a deal that could resolve the three-and-a-half-year-old conflict.

European leaders are planning a meeting with President Trump before a U.S.-Russia summit, stressing that a long-term security guarantee for Ukraine is fundamental.

German Chancellor Friedrich Merz has invited U.S. President Donald Trump, Ukrainian President Volodymyr Zelenskyy, the NATO secretary general and several European leaders to a virtual meeting Wednesday ahead of the Trump-Putin summit later this week.