After surviving an assassination attempt, Navalny now finds himself in police custody. Alexei Navalny returned to Russia from Germany on Jan. 17 and was arrested at the airport upon arrival. Navalny, a leading Russian political opposition figure, had been recovering in Germany since late August, when he was poisoned with Novichok, a military-grade nerve agent, in Tomsk, Russia, in an assassination attempt. The reason for his return isn’t entirely clear, but it undoubtedly demonstrated bravery and patriotism toward his homeland. Navalny is the most prominent opposition figure in Russia. For...