It is not yet known which variant of the MiG-31 was destroyed. One possibility is the MiG-31BM, a modernized interceptor with a new radar station and integrated new R-37 missiles.

the newest MiG-31 variant, which features a Zaslon-M radar with a range of nearly 200 miles, longer range air-to-air missiles, like the R-33S, and more. Source: Globalsecurity.org. It has two ...