Impossible as one of the preconditions for Germany in the "Two (GDR/DDR) Plus Four (US/UK/Fr/SU) Treaty" to permit the reunification was for Germany to give up territorial claims beyond the 1990 borders of East and West Germany. If the Germans didn't agree, they wouldn't have been permitted to reunify let alone expand to their August 1939 borders.Have Germany restore its Pre-WW2 borders after the fall of the Berlin Wall.