Standing in front of the penal colony where Alexey Navalny died, his mother Lyudmila Navalnaya addressed Russian President Vladimir Putin directly in a newly released video and demanded the release of her son's body. | CNN

In August, Russian opposition leader Alexey Navalny was poisoned and nearly killed by the nerve agent, Novichok. CNN and investigative group Bellingcat have since uncovered evidence that Russia’s security service – the FSB – trailed Navalny for years. We follow CNN’s Clarissa Ward as she retraces his steps the moments before he was poisoned, and confronts an FSB operative believed to be part of the team that poisoned Navalny. | CNN