Russia pounds on the gates of Ukraine's 'fortress belt'

Russia is intensifying attacks on Kostiantynivka, a key part of Ukraine's eastern 'fortress belt' defensive line, as its broader offensive in the Donetsk region stalls. Ukrainian commanders report Russian infiltration attempts, while analysts note Moscow's manpower advantage despite Ukrainian drone strikes disrupting logistics. Occupying Kostiantynivka could enable Russian advances northward, but Ukrainian forces assert they can hold the city with current resources.