KYIV, Ukraine — At a secret location in rural Ukraine, columns of attack drones are assembled at night and in near silence to strike deep inside Russia. Their targets are strategic: oil refineries , fuel depots, and military logistics hubs. Since the summer, Ukraine’s long-range drone campaign has ramped up dramatically, pounding energy infrastructure across Russia and stretching Moscow’s air defenses thin. Built from parts made in a scattered network of workshops, these drones now fly much