NATO/Soviet Union 1991 "not one inch eastward"

Claim is that an agreement was made when the Soviet Union ended in 1991 that NATO would not move "one inch eastward", which is quoting U.S. Secretary of State James Baker

Quoting Jeffrey Sachs: "...when the Soviet Union ended in 1991 and an agreement was made that NATO will not move one inch eastward"

Claims, refutations, and/or supporting information:

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