Vladimir Putin killed him. The Russian leader is as responsible for Friday’s death of Alexei Navalny — that country’s most fearless and famous opposition leader — as if he personally had shot him. Navalny, who had rallied anti-Kremlin crowds across Russia before being jailed on bogus charges in 2021, died in a grim Arctic penal colony where he was serving a 19-year sentence. He was the latest in a long string of prominent Russian activists and journalists jailed, shot, or poisoned under Putin (Navalny barely survived a poisoning attempt in 2020). Yet Navalny was unique. His bravery and his cha…