You have to ask yourself, 'What was the desire of the people who, after more than 40 years of Soviet oppression, became free?' They didn't want to be pawns between a residual West that ended somewhere on the borders of the old West Germany and a resurgent Russia. They wanted to be part of the democratic West and, eventually, of the European Union. Those are perfectly legitimate aspirations. This is no threat to Russia –- except to those Russians who cannot conceive of Russia as anything else but a dominant empire that rules not only over the Russian people but over those adjoining Russian territory.
Interview in The Huffington Post - NATO Should Stop Putin From Restoring Czarist Empire, Zbigniew Brzezinski Says, September 3, 2014. (Commenting on criticisms of NATO expansion to Eastern Europe)