Both Russia and China refused to adopt international copyright agreements until pressured by other countries, particularly the US. The US has pursued China's copyright abuses more aggressively than it has pursued similar abuses by Russia. Neigel attempts to explain the reasons for this disparate treatment.
Piracy in Russia and China: A Different U.S. Reaction,
63 Law and Contemporary Problems
Available at: https://scholarship.law.duke.edu/lcp/vol63/iss4/8