A shortage of infantry troops and supply routes under Russian drone attacks have dealt a blow to Ukrainian forces around the strategic eastern city of Pokrovsk. The crucial supply hub lies at the confluence of highways leading to key cities in the Donetsk region. Ukrainian commanders say they do not have enough reserves to sustain defense lines and new recruits are unprepared and sometimes abandon positions. Heavy fog in recent days prevented Ukrainians from effectively using surveillance drones, allowing Russian troops to control dominant heights and take more territory.