Russian opposition activist Alexei Navalny, a prominent critic of President Vladimir Putin, died Friday at a jail in the Arctic region, Tass and Interfax news agencies said, a development that prompted Western leaders to issue harsh criticism of the country's authorities under Putin.Quoting the Federal Penitentiary Service, Tass reported that Navalny, who was serving a sentence in northern Russia's Yamalo-Nenets Autonomous Region over charges of fraud and extremism, "felt unwell" after a walk and "almost immediately" lost consciousness.Medics arrived right away and attempted to resuscitate …READ FULL ARTICLE