Jailed activist and journalist Vladimir Kara-Murza has become the most high-profile political prisoner in Russia's penal colony system after he decried Vladimir Putin's conlict in Ukraine as a war of aggression rather than a "special military operation"

The Arctic gulagwhere Putin sends opponents like Alexei Navalny to die forces prisoners to suffer sub zero temperatures and even sees them threatened with rape if they fail to stump up bribes to pay off guards.