andreas hillgruber andrei gromyko austria bundestag christian social union cold war communism czechoslovakia denazification european defence community france free democratic party freedom of assembly german party german reunification germany great britain gustav heinemann jakob kaiser japan journalism konrad adenauer korean war minister of intra-german relations moscow nato north korea oder-neisse line otto grotewohl paris peace treaty poland potsdam conference rhenish republic rhineland social democratic party of germany socialist unity party of germany south korea soviet union superpower disengagement thomas dehler treaty on the final settlement with respect to germany united nations united states walter ulbricht weimar republic world war ii