Ukraine’s extraordinary attack deep inside Russia has, at a stroke, rewritten the rules of modern war. On Sunday a swarm of small drones, each costing under $500, rose over four Russian airfields deep inside Siberia and the Arctic and destroyed over forty strategic bombers reportedly worth over $7 billion. Thanks to meticulous planning, sophisticated military imagination and an underdog’s boldness of vision, Kyiv’s forces have landed a stunning blow on their far stronger opponent, opening a new chapter in the history of human conflict. The question that will be haunting Putin is – what’s next? Ukraine’s famously stone-faced chief of...