faster variants powered by jet engines known as the Geran-3, Geran-4, and Geran-5. The Geran-3 made its combat debut last year. On Monday, Ukraine's military intelligence agency, the GUR, said Russia had started using the newer Geran-4 in attacks this month "as a countermeasure against the effectiveness of our interceptor" drones. Geran-4 is powered by a Chinese-made turbojet engine and can fly as fast as 500 km/h (roughly 310 mph) and cruise at an altitude of 5,000 meters (1,640 feet), the GUR said. The drone can carry a highly explosive warhead over a distance of 450 kilometers (280 miles). According to the document, the Geran-5 is equipped with a 200 kilogram-thrust turbojet engine, which GUR identifies as being of Chinese origin. The system is reportedly capable of achieving a maximum range of 950 kilometres and a top speed of 600 km/h while retaining the Geran-2’s 90 kg payload. Another jet-powered variant, the Geran-4, reportedly is also under development. Compare...