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"If you look at NATO's text books and at the maths which we did [in planning the counter-offensive], four months should have been enough time for us to have reached Crimea, to have fought in Crimea, to return from Crimea and to have gone back in and out again," General Zaluzhny says sardonically. Instead he watched his troops and equipment get stuck in minefields on the approaches to Bakhmut in the east, his Western-supplied equipment getting pummelled by Russian artillery and drones. The same story unfolded on the offensive's main thrust, in the south, where newly formed and inexperienced brigades, despite being equipped with modern Western kit, immediately ran into trouble.

"First I thought there was something wrong with our commanders, so I changed some of them. Then I thought maybe our soldiers are not fit for purpose, so I moved soldiers in some brigades," says General Zaluzhny. When those changes failed to make a difference, the commander told his staff to dig out a book he once saw as a student in a military academy in Ukraine. Its title was "Breaching Fortified Defence Lines". It was published in 1941 by a Soviet major-general, P. S. Smirnov, who analysed the battles of the first world war. "And before I got even halfway through it, I realised that is exactly where we are because just like then, the level of our technological development today has put both us and our enemies in a stupor."

That thesis, he says, was borne out as he went to the front line in Avdiivka, also in the east, where Russia has recently advanced by a few hundred metres over several weeks by throwing in two of its armies. "On our monitor screens the day I was there we saw 140 Russian machines ablaze—destroyed within four hours of coming within firing range of our artillery." Those fleeing were chased by "first-person-view" drones, remote-controlled and carrying explosive charges that their operators simply crash into the enemy. The same picture unfolds when Ukrainian troops try to advance.

But by holding back the supply of long-range missile systems and tanks, the West allowed Russia to regroup and build up its defences in the aftermath of a sudden breakthrough in Kharkiv region in the north and in Kherson in the south late in 2022. "These systems were most relevant to us last year, but they only arrived this year," he says. Similarly, f-16 jets, due next year, are now less helpful, suggests the general, in part because Russia has improved its air defences: an experimental version of the s-400 missile system can reach beyond the city of Dnipro, he warns.

Yet the delay in arms deliveries, though frustrating, is not the main cause of Ukraine's predicament, according to General Zaluzhny. "It is important to understand that this war cannot be won with the weapons of the past generation and outdated methods," he insists. "They will inevitably lead to delay and, as a consequence, defeat."

General Zaluzhny is desperately trying to prevent the war from settling into the trenches. "The biggest risk of an attritional trench war is that it can drag on for years and wear down the Ukrainian state," he says. In the first world war, mutinies interfered before technology could make a difference. Four empires collapsed and a revolution broke out in Russia.

Ukraine’s commander-in-chief on the breakthrough he needs to beat Russia (economist.com)