Unicorn Hunt (movie, 1989)

Summer, 1944. A military airbase near the very front-line. A young soviet pilot Sergey makes his first practice flight. In the course of this flight he hears a call for help on the radio from Russian pilots, having an unequal air combat with superior forces of the enemy. Sergey rushes to their rescue. His plane gets shut down, and he is taken prisoner. Soon he is taken to a special flight school, where future German aces are prepared and Russian pilots at the wheel of captured Russian aircrafts are used as living targets. Nobody wants to put up with such situation, and they prepare an escape.