This article points out the current difficulties faced by Russians wanting to purchase online in Russia due to the lack of credit card payment and banking payment systems. If PayPal comes on board, this will likely change dramatically.
Paradoxically, this may have a beneficial result - a reduction in credit card theft. Compuserve pulled out of Russia due to massive abuse from users of stolen credit cards. It is just possible that ready availability of legitimate credit card payment systems will go some way to reducing the need for such fraud.
Disclaimer: <I chose my words carefully in constructing that last paragraph>