The USA and the USSR, Great Britain and France sign the Four-Power Agreement on Berlin. The Soviet Union guarantees that civilian traffic between West Berlin and West Germany will not be hindered in future.more
West German Chancellor Willy Brandt goes on a state visit to the Soviet Union; he is received by CPSU General Secretary Brezhnev in Oreanda in the Crimea.
29 September
1971
The West German government reacts to the growing problem of environmental pollution with an environmental programme.