Volker Rühe (born 25 September 1942) is a German politician of the Christian Democratic Union (CDU). He served as German Defence minister from 1 April 1992, succeeding Gerhard Stoltenberg during the first government of a reunified Germany in the fourth cabinet of Chancellor Kohl, to the end of the fifth Kohl Cabinet on 27 October 1998. During his time at the Defence Ministry Rühe played a central role in placing NATO enlargement on the German political agenda. He unsuccessfully ran for the office of minister-president of the German state Schleswig-Holstein in the year 2000, eventually losing against incumbent Heide Simonis.