Summary: <p>The Kremlin says Alexei Navalny died Friday in an Arctic prison. After surviving a poisoning and still making the decision to return to Russia, President Vladimir Putin's most significant opposition figure was serving 19 years on extremism charges.</p><p><br></p><p>What do we know about how Navalny died?</p><p><br></p><p>Amid accusations that he was murdered, what motivations would Navalny's enemies have for acting against him now? </p><p><br></p><p>Not long after a number of Western commentators predicted Putin's demise over the Ukraine war, what does Navalny's death mean for Putin's tightening grip on Russia?</p><p><br></p><p>CBC's Briar Stewart explains.</p>
