The Ukrainian War of Independence was a series of conflicts involving many adversaries that lasted from 1917 to 1921 and resulted in the establishment and development of a Ukrainian republic, most of which was later absorbed into the Soviet Union as the Ukrainian Soviet Socialist Republic of 1922–1991. The conflict is frequently viewed within the framework of the Southern Front of the Russian Civil War of 1917–1922, as well as the closing stage of the Eastern Front of the First World War of 1914–1918.