It comes after advisers of the U.S. President were reportedly left 'ashen-faced' and 'frightened' following the two-and-a-half hour summit between the two leaders on Friday about the ongoing conflict.

President Volodymyr Zelensky of Ukraine said he would meet with President Trump in Washington on Monday. Mr. Trump and President Vladimir V. Putin of Russia held talks in Alaska…

Zelenskyy, who was not invited to Alaska for the summit, said he held a “long and substantive” conversation with Trump early Saturday.