A guard looks on nervously. With every step, the air thickens with the smell of petrol. Around a corner is the workshop, and the buzz of manufacturing. Inside, lab-coated technicians are busy assembling grey birds under the glow of overhead lights. Young men in t-shirts scuttle about, before packing the drones in boxes for onward delivery. The destination for some of them will be 1,000km away and more—hunting for important targets inside Russia.