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Dr Svetlana Savranskaya, an academic at George Washington University in the United States, has uncovered documents showing that US officials gave successive Russian leaders assurances that NATO would not expand eastwards towards Russia. Moscow says NATO鈥檚 expansion into former Soviet territories is an aggressive act.

(Photo: a soldier sits in a tank as a NATO flag flies behind during NATO military exercises in Poland. Photo by Sean Gallup/Getty Images)