Russia may have stepped up the frequency and intensity of missile and drone attacks on Ukraine's capital, but Kyiv's air defences appear to be holding firm. So what is the military benefit of targeting urban populations, and why is Vladimir Putin doing so? Historically, wars were fought to destroy the enemy's army and occupy its capital. Mr Putin remains focused on destroying Ukraine's ability to fight (just witness the grinding war of attrition in Bakhmut) and occupying Kyiv by laying it under aerial siege. But will this onslaught help the Russian war effort, or is it simply the actions of...