Five months into its counter-offensive, Ukraine has managed to advance by just 17 kilometres. Russia fought for ten months around Bakhmut in the east “to take a town six by six kilometres”. Sharing his first comprehensive assessment of the campaign with The Economist in an interview this week, Ukraine’s commander-in-chief, General Valery Zaluzhny, says the battlefield reminds him of the great conflict of a century ago. “Just like in the first world war we have reached the level of technology that puts us into a stalemate,” he says. The general concludes that it would take a massive technological leap to...