Brian Krebs on Computer Security at the Washington Post has gone even further into this subject. A quick read with some excellent links and graphics.

Mapping the Russian Business Network

...McQuaid, who helps run the American Red Cross's IT networks, said the people behind RBN have taken notice that some network providers have chosen to block traffic originating from the St. Petersburg provider. ...he's recently seen attackers on RBN hiding the source and destination of their traffic by routing it through compromised home computers in the United States and in Europe as a way to evade blocking filters...

"What we're seeing now is RBN and some Chinese hacker groups are taking over machines in the U.S. and hosting malware or launching attacks from those machines, mainly because they realize their IP space is increasingly being blocked by the rest of the world,"
SWC Council Member JeffC also has some great insight into the RBN