may 6, 1686 - The Treaty of Perpetual Peace (1686) is signed between the Tsardom of Russia and the Polish–Lithuanian Commonwealth, recognizing the former's possession of Left-bank Ukraine and the city of Kiev, as agreed upon in the earlier Treaty of Andrusovo in 1667. The treaty also brings the Tsardom of Russia into the Great Turkish War, on the side of the Holy League of 1684