The Ilyushin DB-4 (Дальний бомбардировщик - Dalniy Bombardirovschik - long-range bomber) or TsKB-56 was a Soviet twin-engined bomber aircraft of the early 1940s. It was a development of the Ilyushin DB-3 and was intended as a replacement for the earlier aircraft but only two prototypes were built engine problems and the need to concentrate production on existing types following the German invasion of the Soviet Union in June 1941 meant that no more examples were built.
Made by Ilyushin.
It is the successor of the Ilyushin DB-3 .