Ukraine’s president urged calm amid intensified warnings of a possible Russian invasion within days, saying he had yet to see convincing evidence of that — even as the United States warned Sunday of more Russian troops pressing closer to Ukraine’s borders and some airlines cancelled flights to the capital of Kyiv.
U.S. President Joe Biden spoke for about 50 minutes Sunday with Ukrainian President Volodymyr Zelensky and renewed promises of what the West says will be tough economic sanctions against Moscow and a NATO buildup in the event of “any further Russian aggression” against Ukraine, the White House said. They agreed to pursue
