Source (YouTube): The American Invasion of Siberia in 1918

Even before World War I ended, the Allies found another war. Thousands of Allied troops landed at four areas around Russia to restore the monarchy and crush a populist revolution. The United States sent 8000 soldiers to Siberia, Canada sent 5000, the UK 1500, and Japan 70,000. The plan had little chance for success and troops were lucky to escape in 1920.