Is it something that naturally occurs in societies? Those who feel nostalgic about the Soviet Union felt this way in 1991 and later on. I doubt younger generations can miss oppression, iron curtains, censorship, planned market economy and other things Soviet Union had.
We still love Soviet movies, music and some other features that are customary to USSR. And we're proud of cultural, military, politic legacy left by USSR. Some people see and emphasize the worst, particularly what @Daq has mentioned yet some of them recollect positive things like education system, free medical care, summer camps for children et cetera. Indeed younger generation can't compare these countries since they were born after collapse of USSR.
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