At about 1am on February 24 last year, Sergei Lavrov, Russia’s foreign minister, received a troubling phone call. After spending months building up a more than 100,000-strong invasion force on the border with Ukraine, Vladimir Putin had given the go-ahead to invade. The decision caught Lavrov completely by surprise. Just days earlier, the Russian president had polled his security council for their opinions on recognizing two separatist statelets in the Donbas, an industrial border region in Ukraine, at an excruciatingly awkward televised session — but had left them none the wiser about his true intentions. (snip) Later that day, several...