Following the Russian Revolution and the Finnish Civil War, Finns were involved in attempts to overthrow the Bolshevists in Russian Karelia (East Karelia), for instance in the failed Aunus expedition. These mainly private expeditions ended after the peace Treaty of Tartu. After the end of the Russian Civil War, and the establishment of the Soviet Union in 1922, the Russian part of Karelia became the Karelian Autonomous republic of the Soviet Union (ASSR) in 1923.