Before Zuckerberg's visit of today, there was a scandalous Russian article accusing Mark for coming to organize an intensive Russian brain drain into Facebook. Interestingly, this article was written by a head of the largest Russian outsourcing company. However, according to the latest news (in Russian) Mr Zuckerberg had a lunch in McDonald and then a nice meeting with the Russian prime-minister: they discussed copyright laws in the Internet (Mark promised Medvedev that Facebook will always support copyright).
I believe nice meetings in Moscow, copyrights, and brain drain from Russia do not very much depend on each other.
See some English links: