Watch Live: Biden addresses Russia's "unprovoked and unjustified" attack on Ukraine

Washington — President Biden is set to address the American people on Thursday afternoon after Russia launched what Ukrainian officials say is a "full-scale invasion", and is expected to announce additional sanctions the U.S. and Western allies will impose on Russia in response to its aggressive actions.

Mr. Biden condemned what he called an "unprovoked and unjustified attack" on Ukraine in a late-night statement Wednesday after Russia began launching strikes against Ukrainian cities, including the capital of Kyiv. The president accused Russian President Vladimir Putin of choosing "a premeditated war that will bring a catastrophic loss of life and human suffering."

Ukraine's State Border Guard Service said Russian forces started breaking through the country's border in the Kyiv region, and Oleksiy Arestovich, an adviser to Ukrainian President Volodymyr Zelensky, said "dozens" of Ukrainian troops were killed amid Russia's attacks.