The early period of partition plans evolved by the European Advisory Commission is documented . When in February 1945 , the United States , Great Britain , and the Soviet Union decided to split the former German Reich in occupation zones at the Yalta Conference , including a fourth area assigned to the French , the German capital likewise was divided into four sectors . In late April , Soviet Red Army troops fought their way into the city during the Battle of Berlin and enforced the unconditional surrender by the German Wehrmacht armed forces . In Summer they pulled out from the city 's Western sectors according to the agreements concluded
Yalta Conference
Yalta Conference
Allied Museum