The Russian army penetrates Kostiantynivka, a key stronghold of Ukrainian defense in Donbas

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In recent months, Ukraine has deployed a successful campaign of deep attacks on Russian refineries and supply routes to Crimea with medium-range drones, which has generated optimism among European allies and Western analysts. But, despite these good results, the advance of Russian troops in Donbas – a region formed by the provinces of Donetsk and Luhansk, the latter now almost entirely occupied – seems inexorable and has accelerated with the battle of Kostiantynivka, an enclave south of the large Ukrainian defensive line in Donetsk, where Ukraine still holds a quarter of the territory.