Russia has a history of going after dissidents. One senior Kremlin official has now warned freed prisoners to 'disguise themselves.'

• Dmitry Medvedev warned freed Russian dissidents to watch their backs after the recent prisoner exchange.
• Prisoners swapped in the deal with the West included Vladimir Kara-Murza and Ilya Yashin.
• Russia has a history of targeting dissidents and defectors.

Russian opposition figures and dissidents freed in Thursday's mass prisoner exchange should "adopt new names" and "disguise themselves," a senior Russian politician has said.

Dmitry Medvedev, Deputy Chairman of Russia's Security Council and a former Russian president, made the thinly veiled threat in a post on Telegram on Thursday.