A diplomatic scramble unfolded Saturday after President Donald Trump announced he would meet his Russian counterpart, Vladimir Putin, next week in Alaska, as European leaders rushed to understand the terms of the meeting and ensure Ukraine was not being left out of discussions about its future.

Ukraine and its European allies sought on Sunday to present a united front ahead of a meeting this week between President Trump and President Vladimir V. Putin of Russia that risks sidelining Kyiv in future peace talks.

On Friday evening, Trump posted on his social media site Truth Social that a "highly anticipated meeting" between him and Putin would take place on 15 August in the "great state of Alaska". "Further details to follow," he said. Trump had said the meeting location would be "a very popular one for a number of reasons".