Russian-Polish War 1654-1661 years losses: 1.4 million people (52% of population) Great Northern War 1700-1721 years losses: 800 000 (30% of population) The War of 1812 1812-1814 years losses: 1 million people (25% of population) 1st World War and the Civil War 1914-1920 years losses: 1.5 million people (20%) Stalinist repression 1930-1940 years losses: 600 000 (10% of population) 2nd World War years 1939-1945 losses: 3 000 000 people (33% of population) Losses are considered, including the victims of the war, repression, hunger, and deported.