Alexey Navalny and Putin's history of suspected poisonings and crackdows.

From 2020 and 2017, Lesley Stahl's two interviews with Alexey Navalny, the Russian opposition leader who reportedly died in a prison north of the Arctic Circle this week. Also from 2017, Stahl's chat with Russian opposition activist Vladimir Kara-Murza, who was twice poisoned to the brink of death by a mysterious toxin. And from 2013, Stahl's story on Russian punk protest band Pussy Riot.