The Ostpolitik reference article from the English Wikipedia on 24-Apr-2004
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Ostpolitik

Ostpolitik or Eastern Politics was the effort by Willy Brandt, Chancellor of West Germany, to normalize relations with Eastern European nations including East Germany.

Among the elements of Ostpolitik was abandonment of the Hallstein Doctrine and recognition of the Oder-Neisse line as the border between Poland and East Germany.