- August 14, 1018 - Polish Expedition to Kiev: The Polish army captured Kiev; Yaroslav I the Wise fled to Novgorod.
- August 15, 1327 - The ambassador of the Golden Horde was trapped and burned alive during an uprising in the Grand Duchy of Tver.
- August 22, 1552 - Siege of Kazan (1552): Russian armed forces arrived at Kazan.
- August 30, 1721 - Great Northern War: The Treaty of Nystad ended the war. Sweden ceded Estonia, Livonia and Ingria to Russia.
- August 31, 1917 - Kornilov Affair: Lavr Kornilov was arrested.