作为二战后最伟大的美国外交官之一的乔治·凯南曾经写道,西方社会在50年来犯得最大的一个错误就是，在前苏联共产政权倒台之后，北约还继续东扩。
George Kennan, one of the greatest American diplomats of the post-war years, once wrote that the Western world was committing its biggest mistake in 50 years time by expanding NATO after Soviet communism collapsed.