A secret document dating back to talks between senior officials from the United States, the United Kingdom, France and the Federal Republic of Germany (FRG) in Bonn on 6 March 1991, showed that the West and the North Atlantic Treaty Organisation "NATO" did not abide by its promises not to expand to the east, even by "one centimetre".
The German newspaper, "Spiegel", said that the secret document, recovered from the British National Archives, provides evidence that Western countries have agreed to reject the membership of Eastern European countries in the alliance, which means that Russia's current grievance about NATO's expansion to the east is justified.