Al Jazeera has obtained footage that gives a shocking insight into the violence inside Russian prisons.
The video shows inmates being abused by masked guards, with some detainees beaten until close to unconsciousness.
It has been eight months since Russia's president, Dmitry Medvedev, called for a review of the Russian Prison system.
But as Al Jazeera's Neave Barker found out, there is no let-up in claims of abuse.
Source: Al Jazeera