In the dawn hours of May 3, Moscovites awoke to an unbelievable sight: Two suicide drones had somehow managed to penetrate the city's air defences and explode on the roof of the Kremlin itself. Such an attack would have been unthinkable when Vladimir Putin declared war on Ukraine a year earlier, and yet it was only the beginning. Three weeks later, partisans began raiding Russia's borders and then a swarm of drones slammed into Moscow's wealthy suburbs. In-fighting between Russia's military and Putin's warlords is now at fever pitch, Ukraine's counter-attack is looming, and an opposition politician even went so...