First, utopianism is probably a necessary social device for generating the superhuman efforts without which no major revolution is achieved.
The tragedy of the October revolution was precisely that it could only produce its kind of ruthless, brutal, command socialism. The Age of Extremes (1992)
In terms of political geography, The French Revolution ended the European Middle Ages. The Age of Revolution (1962)
The world that went to pieces at the end of the 1980's was the world shaped by the impact of the Russian Revolution of 1917. The Age of Extremes (1992)