Answer: soviet union Berlin was entirely in East Germany: The DDR(Deutsche Demokratiosche Republik). It was divided into four zones: US, British, French & Russian. (As was Germany itself, East Germany being the Soviet part. The three remaining became West Germany, The Bundes Republik Deutchland) In 1961 the Russians ( or the East Germans) built the Berlin Wall dividing the city & denying access to the West. Similarly there was along the border between West Germany & East Germany, the IGB (Inner German Border) the longest barbed wire fence in History.