LT Selfridge,
The MiG-31 story is bogus.
Russia has not sent Mikoyan MiG-31 supersonic interceptors to Syria and does not intend to operate the aircraft in the war-torn country, CEO of Russian Aircraft Corporation MiG Sergei Korotkov stated refuting recent rumors.
No MiG-31s for Damascus: Russia Denies Sending Interceptors to Syria