'The Soviet Union is a decidedly unusual imperial entity. It is numerically dominated by one nation, the Russians. But that domination has not enabled the Russians to flourish economically, even by comparison with many of their ostensible 'colonies'. Nor have the languages and cultures of the principal non-Russian peoples withered. The truth is that this is not in the normal sense a Russian empire. It is a communist one, perhaps the first empire in history to be ruled over by a political party. From that fact flow the anomalies and contradictions of this unprecedented multi-national union.'
The 41st BBC Reith Lectures: The rediscovery of Politics, Authority, Culture and Community on the Union of Soviet Socialist Republics (USSR)