Ukrainian President Volodymyr Zelenskiy on May 29 thanked U.S. citizens who have fought for Kyiv following Russia's full-scale invasion of February 2022. Speaking in English in a video address marking the U.S. Memorial Day holiday, Zelenskiy said it was important to remember the price paid by many to "give light to freedom." "We Ukrainians will always be grateful to the U.S. and every American for extraordinary support which helps us [fight] Russian tyranny." An unknown number of Americans have volunteered along with other foreign nationals to fight alongside Ukrainian soldiers. Casualty figures are not known.