The Yakovlev Yak-4 (Service names Yak-4, BB-22bis ( "Blizhnij Bombardirivschik", "short-range bomber")) was a Soviet light bomber used during World War II. It was developed from the Ya-22/Yak-2.
Read more about Yakovlev Yak-4: Design and Development, Operators, Specifications (Yak-4)