Russian expansion refers to the historical process by which the territory of the Russian Empire and later the Soviet Union grew significantly from the 16th century onward. This expansion involved the annexation of various regions, including parts of Siberia, Central Asia, and Eastern Europe, driven by economic interests, military conquests, and the desire for strategic advantages. The expansion continued into the 20th century, with the Soviet Union extending its influence over Eastern Europe after World War II. This led to the establishment of satellite states and a significant geopolitical presence, shaping the political landscape of the region during the Cold War.