Ukraine’s drone manufacturers worry that the energy ceasefire won’t last at a covert test-flight facility

In a secluded area out of sight, Ukrainian engineers are testing a long-range drone called Raybird. The small, airplane-shaped vehicle is launched on a launchpad, stretched like an arrow on a crossbow, and shot into the air. Raybird has more than 20 hours of flight time and a range of over 1,000 km (620 miles) on a single flight without refueling.