https://www.history.com/this-day-in-history/soviets-agree-to-hand-over-power-in-west-berlin?cmpid=email-hist-tdih-2022-0 [login to see] 2&om_rid=
Fulfilling agreements reached at various wartime conferences, the Soviet Union promises to hand power over to British and U.S. forces in West Berlin. Although the division of Berlin (and of Germany as a whole) into zones of occupation was seen as a temporary postwar expedient, the dividing lines quickly became permanent. The divided city of Berlin became a symbol for Cold War tensions.