Yakovlev Yak-30 (1960)
The Yakovlev Yak-30 (NATO reporting name Magnum) was Yakovlev's entry in a competition for the first military jet trainer aircraft designed for Warsaw Pact nations. Designed to succeed the Yak-17UTI, it also led to the development of the Yakolev Yak-32 sport jet. The Yak-30 lost to the L-29 Delfin, and neither it or the Yak-32 entered production.
Read more about Yakovlev Yak-30 (1960): Design and Development, Operational History, Operators, Specifications (Yak-30)