Mikoyan-Gurevich MiG-15 (NATO reporting name: "Fagot") is a jet fighter developed for the Soviet Union by Mikoyan-Gurevich OKB. MiG-15 is often mentioned along with the North American F-86 Sabre as among the best fighter aircraft of the Korean War and in comparisons with fighters of other eras. MiG-15bis is an improved MiG-15 version; the main difference is the improved engine, the Klimov VK-1. Noticeable change is a huge improvement of thrust-to-weight ratio, making the MiG-15bis one of the bes... Mikoyan-Gurevich MiG-15 (NATO reporting name: "Fagot") is a jet fighter developed for the Soviet Union by Mikoyan-Gurevich OKB. MiG-15 is often mentioned along with the North American F-86 Sabre as among the best fighter aircraft of the Korean War and in comparisons with fighters of other eras. MiG-15bis is an improved MiG-15 version; the main difference is the improved engine, the Klimov VK-1. Noticeable change is a huge improvement of thrust-to-weight ratio, making the MiG-15bis one of the best climbing planes compared to other planes at similar battle rating. The other modifications include hydro booster ailerons control to help aircraft keep high roll rate when maneuver, improved avionics, radio navigation, It also served as the starting point for development of the more advanced MiG-17.