Russian-UK dissident Kara-Murza disappears from jail in latest sign a prisoner swap with West may be close ReutersUS Reporter Released By Russia in Multi-Country Prisoner Swap BloombergRussia agrees to free Evan Gershkovich and Paul Whelan in multi-country prisoner swap ABC NewsRussia May Free 20-30 Political Prisoners in Historic Exchange With West The Moscow TimesPutin Gets Ready to Swap U.S. Captives for Russian Assassin The Daily Beast