This time last year, Volodymyr Zelensky was touring western capitals, calling for weapons and money to launch a decisive summer offensive. Nato eventually provided Leopard and Challenger tanks, Bradley infantry fighting vehicles, M777 howitzers, Himars rocket artillery and Patriot air defences – but too little, too late. The much-vaunted offensive went nowhere, despite a mutiny by the Wagner Group and widespread disarray in the Russian army.