Tim Walker has an extensive story at the Independent titled "Sergey Brin: Engine driver". http://www.independent.co.uk/news/people/profiles/sergey-brin-engine-driver-1869546.html

It covers much of Sergey Brin's background and history. There is an emphasis on the USSR and its impact on his input on Google's dealings with China.

USSR no longer exists since 1991. It's Russia now. But yes when Brin was in it was called USSR or CCCP.