The Undernet

On the day that Edward Snowden comes to Moscow in his role of NSA whistleblower, a reminder of the Kremlin's Internet surveillance system. Introduced in late 2012, in its thoroughness and intrusiveness it probably outdoes most other systems of this kind in operation throughout the world today. As Andrei Soldatov and Irina Borogan point out in Wired magazine:

the new Roskomnadzor system introduces DPI (deep packet inspection) on a nationwide scale. Although DPI is not mentioned in the law, the Ministry of Communications — along with the biggest internet corporations active in Russia — concluded in August that the only way to implement the law was through deep packet inspection.