Koningsberg was the captial of East Prussia from the Late Middle Ages until 1945. Königsberg was heavily damaged by Allied bombing in 1944 during World War II and was subsequently conquered by the Red Army after the Battle of Konigsberg in 1945. The city was annexed by the Soviet Union according to the Potsdam Agreement and largely repopulated with Russians.
Thanks zommka for the great card (RU-420088).