The Soviet Yakovlev Yak-7 was developed from the earlier Yak-1 fighter, initially as a trainer but converted into a "heavy" fighter. As both a fighter and later reverting to its original training role, the Yak-7 proved to be a capable aircraft and was well liked by air crews. The Yak-7 was simpler, tougher and generally better than the Yak-1.
Read more about Yakovlev Yak-7: Design and Development, Operational History, Variants, Operators, Specifications (Yak-7)