Security Code with Praveen Swami : How a poisoner’s handbook helped Vladimir Putin rise to absolute power

The mercenary-warlord Yevgeny Prigozhin is just the latest of President Vladimir Putin's victim to meet a mysterious end. The Soviet-era KGB, which Putin worked for, for had a formidable talent for killing ingenuously using poisons and explosives. The Russian president has shown he paid attention to his lessons at the KGB academy.