Russia’s leading opposition figure, Alexei Navalny, who united people in his fight against Vladimir Putin’s regime, died Friday in a remote Arctic prison, where he was serving a decades-long sentence on trumped-up charges. He is survived by his wife, two kids, and the millions of Russians at home and abroad who yearned for a better future. The Kremlin’s propaganda machine, now in overdrive, lists the cause of death as a blood clot, spinning a narrative that Putin — ever-so-popular with the people — didn’t need Navalny to die. In his 25 years in power, Putin has killed journalists, politicians, oligarchs,...