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Did US promise Russia Nato wouldn't expand after German unification? New evidence suggests the answer is no, but there's plenty of ambiguity.

TWENTY years ago, dictatorships across Central and Eastern Europe toppled. During this season of remembering, the focus has rightly been on celebration of the new freedoms gained by the inhabitants of those countries: to speak freely, to travel, to vote and to choose their own national futures and alliances. Yet the legacy of 1989 has difficult aspects as well, mostly centering on the origins and legitimacy of later NATO expansion to former East German and Warsaw Pact territory; acknowledgment of them by the United States could greatly improve American and Russian relations.

Moscow has long asserted that the Soviet Union allowed Germany to unify only in return for a pledge from Washington never to expand the Atlantic alliance. Former advisers to Presidents George H. W. Bush, Bill Clinton and George W. Bush have transcended partisan differences in dismissing the Russian claim. An internal State Department review during the Clinton era concluded that no legally binding prohibition on NATO enlargement emerged from the era of German unification.

Since then, however, it has become possible to reconstruct what happened from first-hand evidence. Former Chancellor Helmut Kohl of Germany released the papers of his office, which inspired the former Soviet leader Mikhail Gorbachev to publish many of his own. A number of other leaders and institutions also opened files in advance of the 20th anniversary of the fall of the wall: the George H. W. Bush Presidential Library, Secretary of State James Baker, the German Foreign Ministry and the British Foreign and Commonwealth Office among them.
Read entire article at Mary Elise Sarotte, a professor of international relations at the University of Southern California, in an NYT op ed