Alexei Navalny, Russia’s leading opposition figure, demonstrated unfathomable courage in returning home after the Kremlin had poisoned him with Novichok. Arrested on arrival, Navalny is now holed up in Moscow’s notorious Sailor’s Silence transit prison. Yet as he languishes behind bars, Navalny poses his greatest threat yet to Vladimir Putin’s regime. And today, on the streets of Russia, things could come to a head in the fight between Navalny and Putin.