In a foggy field in northeast Ukraine, four soldiers stare at red ​and yellow dots on a screen in the back of a van, armed with interceptor drones and energy drinks to get through the night. These pilots, and about a thousand other crews like them , are on the frontlines of Ukraine's drive to knock one of Russia's most potent weapons out of the war: the Shahed drone. "Even if you use 50 drones to shoot down one Shahed, it's worth it," said Borys, the commander of the crew, who was a TV news producer before the war upended his life. "One Shahed can fly in and destroy something far more valuable." The pioneering low-cost, long-range attack drones designed by Iran have indeed become the scourge of Ukraine, with Russia unleashing ⁠thousands of them on its enemy every month. Moscow has adapted the design of the Shahed, which it calls the Geran, to include improved navigation and engines as well as larger warheads.…