A former Russian oil tycoon has gone on hunger strike over what he claims is an unfair extension of his prison sentence. 

Mikhail Khodorkovsky, once Russia's richest man, is serving an eight-year sentence for tax evasion following a trial his supporters described as a farce.

Last week his detention in Moscow's notorious Sailor's Rest prison was extended by three months, in a trial that could lead to him being sentenced to an additional 22 years on charges of theft and money laundering.

Neave Barker reports from Moscow.

Source: Al Jazeera