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.

A meeting between Trump and Putin is tentatively scheduled for the end of next week, a senior White House official told NBC News.

President Donald Trump is open to holding a trilateral summit in Alaska with Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskiy, a White House official said on Saturday.