After Finland declared independence from Russia, a number of Finnish nationalists supported the idea of a Greater Finland attained through the annexation of Russian East Karelia. This was seen as an effort to form a unified country for Balto-Finnic tribes, who were regarded as kindred by these activists. The resulting two incursions by Finnish volunteers into Russia, called the Viena and Aunus expeditions, are not considered wars against Russia in Finnish historiography. In Russia, this conflict, as well as the Finnish expeditions into East Karelia and the Petsamo in 1918–1920, is considered a military intervention and called the "First Soviet–Finnish War". This period of disagreement and uncertainty about borders was ended with the Treaty of Tartu, where Finland and the Baltic states first recognised the Russian Soviet Federative Socialist Republic as a sovereign state, and established the border between Finland and RSFSR.