President Donald Trump’s approach to ending Russia’s war against Ukraine has left European allies and Ukrainian officials worried they are being largely sidelined by the new U.S. administration as Washington and Moscow plan direct negotiations.

U.S. Secretary of State Marco Rubio arrives in Saudi Arabia on Monday ahead of expected talks with Russian officials aimed at ending Moscow's nearly three-year war in Ukraine.

The talks are seen as a major step in improving U.S.-Russia relations, but they're creating anxiety in Ukraine.