"No Impairment Of Soviet Security Interests"
Declassified documents show security assurances against NATO expansion to Soviet leaders from Baker, Bush, Genscher, Kohl, Gates, Mitterrand, Thatcher, Hurd, Major, and Woerner.
CIA Director Robert Gates’s criticism of pressing ahead with expansion of NATO eastward:
"Gorbachev and others were led to believe that wouldn’t happen.”
"The first concrete assurances by Western leaders on NATO began on January 31, 1990, when West German Foreign Minister Hans-Dietrich Genscher opened the bidding with a major public speech at Tutzing, in Bavaria, on German unification. The U.S. Embassy in Bonn (see Document 1) informed Washington that Genscher made clear “that the changes in Eastern Europe and the German unification process must not lead to an ‘impairment of Soviet security interests.’ Therefore, NATO should rule out an ‘expansion of its territory towards the east, i.e. moving it closer to the Soviet borders.’” The Bonn cable also noted Genscher’s proposal to leave the East German territory out of NATO military structures even in a unified Germany in NATO."