Ukraine’s expanding drone campaign against Russian supply lines is turning a key route from Rostov‑on‑Don toward occupied southern Ukraine into a so‑called “highway of death,” with swarming strikes on trucks, tankers, and bridges aimed at forcing a logistics lockdown on Moscow’s forces. The strategy, built around persistent drone harassment of convoys and chokepoints, is designed to raise the cost of Russia’s war—but also risks fiercer retaliati…