The great medieval empire of the Kievan Rus covered the territories of present-day European Russia, Belarus and Ukraine. This map shows the influence of the Byzantine Empire on the settlement region of the Kievan Rus.
Kievan Rus, 11th century, map, 2006, copyright: Captain Blood, Britta Müller-Schauenburg, image source: Wikimedia Commons, Creative Commons-Lizenz Namensnennung-Weitergabe 3.0 Unported.