Key Dates in Alexey Navalny's Campaign Against Putin

FILE - In this file photo taken on Friday, Aug. 17, 2012, Russian protest leader Alexei Navalny gestures as he walks outside a court in Moscow, Russia.

Russia's top opposition politician Alexey Navalny, who died Friday in an Arctic prison according to Russia's penitentiary service, survived a poisoning attack in 2020 only to be sentenced to 19 years in a penal colony.