Russia’s pro-war activists delivered over the weekend their most cutting criticism of the military’s performance in Ukraine to date, following the humiliating withdrawal of Russian troops from the southern Ukrainian city of Kherson. By Sunday, the drumbeat of denunciations broke the taboo against singling out President Vladimir Putin himself and Russia’s very system of government. Alexander Dugin — the right-wing ideologue whose concept of a “Russian World” helped inspire the war — wrote online that the main job of an autocratic leader is to protect the people and the lands under his control. “The authorities in Russia cannot surrender anything...