Putin critic Vladimir Kara-Murza thought he was being executed before his release in historic prisoner swapPutin critic Vladimir Kara-Murza thought he was being executed before his release in historic prisoner swap 

Vladimir Kara-Murza, a Russian opposition politician and one of President Vladimir Putin’s fiercest critics, has described the psychological torture he endured during 11 months in solitary confinement, saying he thought he would die in a Siberian cell.