Possibly inspired by knowledge of the Junkers Ju 287 and the results of testing the second prototype, several designers in the Soviet Union studied the swept-forward wing configuration by means of full-scale gliders launched from "mother" aircraft. This illustration show one of the gliders tested, designed by V P Tsibin.

Экспериментальный самолет П.В.Цыбина с крылом обратной стреловидности (испытывался в планерном варианте).

Планер ЛЛ-2 Цыбина с крылом обратной стреловидности, 1947г.
The Tsibin glider.