The Ukrainian film director Oleg Sentsov, who is serving a 20-year prison sentence in Russia, has smuggled a defiant letter from his jail in Siberia, comparing himself to a “nail that will not bend”.Sentsov, a film-maker and pro-Ukrainian activist, was arrested in Crimea in May 2014 soon after Russia’s president, Vladimir Putin, annexed the peninsula. He had been helping to deliver food to Ukrainian soldiers marooned at their bases following Russia’s takeover.
