Russian Civil War
At the same time, some foreign countries were worried about the communists, who were ruling Russia and feared that communism would come to their countries if the Russian communists were successful and so they helped fight against the Red Army. The main allies of World War I started the Siberian Intervention and otherwise helped the White Army. Their former enemies, the former Central Powers, also fought to get back land that they had lost during World War I. Slowly, the war became very large, and it continued for a few more years.