Britain , the US , and the USSR then negotiated Germany 's future at the Potsdam Conference .
That summer , the entire state was handed over to Soviet forces as agreed in the London Protocol of September 1944 .
Britain , the US , and the Soviet then negotiated Germany 's future at the Potsdam Conference .
That summer , the entire state was handed over to Soviet forces as agreed in the London Protocol of September 1944 .