Under the Romanovs, the Russian Empire expanded through a combination of military conquests, treaties, and colonization. Expansion occurred primarily eastward into Siberia, southward into Central Asia and the Caucasus, and westward into territories such as Ukraine, Belarus, and the Baltic region. Major cities like Kiev, Kazan, and Astrakhan were conquered, and territories were acquired through treaties with neighboring states such as Sweden, Poland-Lithuania, and the Ottoman Empire