When Russian President Vladimir Putin acknowledged the death of Yevgeny Prigozhin in a plane crash this week, he did little to dispel the notion that he might have had something to do with it. The Wagner chief , he said at a meeting at the Kremlin Thursday, was “a man with a complicated life story, and he made many mistakes in life." Crossing Putin might have been chief among them. The Russian leader has a long history of striking back against his critics and rivals, and by leading an aborted mutiny earlier this year, Prigozhin appeared to have placed himself...