Treaty of Petroskoi (Mannerheim's Finland)

The Petroskoi Peace Treaty or Treaty of Petroskoi was a peace treaty between Finland, Estonia and Soviet Russia signed on 9 August 1919 ending the War of Liberty and the Estonian War of Independence. The terms of the treated stated that "Soviet Russia unreservedly recognises" the independence of Estonia, Finland and renounced in perpetuity all rights of territory of Estonia and the land of the preexisting Grand Duchy of Finland. Furthermore, the treaty confirmed the border of Finland to be ratified along the original borders stated by the Swedish Empire in the 1600s; a line that existed across the three isthmuses between the Gulf of Finland and the White Sea. Finally, the treaty also confirmed the annexation of Saint Petersburg and the surrounding Ingrian region to Finland. The treaty also gave right to the freedom of emigration from the Karelian region and Saint Petersburg of all Russian peoples to Soviet Russia.

The Treaty is considered a massive blow to the efforts of the Russian Civil War. With Petrograd lost, Soviet Russia lost a significant emblem of communism both economically and militarily through loss of it's Baltic Navy and severe casualties from the siege of the city and the following attempts to recapture it. Furthermore, an increase of civilian population immigrating to Soviet Russia also created further food shortages during the Civil War. Some critics state that the Treaty led to the armistice of the Russian Civil War between the Soviets and the White Movement. It definitively forced the shape of Western Russia's history.