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The Russo-Polish War of 1654–1667, also known as the Thirteen Years' War, was a major conflict between Russia and Poland for control of Ukraine. The war began when Russia accepted the Pereyaslav Agreement, a proposal to annex Ukraine made by Bohdan Khmelnytsky, the hetman of the Zaporozhian Cossacks, who had led a revolt against Polish rule.1

Control of Ukraine shifted multiple times during the war, with inhabitants divided in their allegiances. The conflict concluded with the Truce of Andrusovo in 1667, which divided Ukraine along the Dnieper River. Russia received the eastern portion of Ukraine, along with the cities of Kyiv and Smolensk. This truce was later confirmed by a treaty in 1686.1

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