is very similar in some aspects to the BM standard. Unlike the BS standard, aircraft modernized into the BSM standard are equipped with air refueling probe. Improvements were made to the aircraft canopy, where new and better heat resistant glass was used, thus enabling the MiG-31BSM to fly with cruise speed of at long distances without any damage. Furthermore, new faster central computer Baget-55-06 is used with addition of multi-functional displays, one for the pilot and three for the weapons operator-navigator. Also there is a new set of navigation equipment. The MiG-31BSM has multi-role capability with ability to use anti-radar, anti-ship and air-to-ground missiles. Main visible difference between the BS and BSM standards is adding of the rear-view periscope above the front cockpit canopy. MiG-31K Modified MiG-31BM variant able to carry the hypersonic Kh-47M2 Kinzhal ALBM. Ten aircraft were modified by May 2018. With this modification and with removed APU for air-to-air missiles, the aircraft gained a sole role of an attack aircraft. MiG-31F Planned fighter-bomber intended for use with TV, radar and laser-guided ASM weapon systems. Never entered serial production. MiG-31FE Planned export version of the MiG-31F. MiG-31I (Ishim) Proposed modification for air launch to orbit of small spacecraft with a payload of to altitude or to altitude orbit. MiG-31 (Izdeliye 08) MiG-31 modified into a launch-platform for the Izdeliye 293 Burevestnik anti-satellite missile. At least two prototypes are converted. Tests from September 2018. Operators Kazakh Air Defense Forces 610th Air Base (Sary-Arka Airport) From 20 to 31 in inventory as of 2020. Russian Aerospace Forces 4th Centre for Combat Application and Crew Training (Savasleyka) 22nd Fighter Aviation Regiment (Tsentralnaya Uglovaya) 98th Independent Composite Aviation Regiment (Monchegorsk) 764th Fighter Aviation Regiment (Perm/Bolshoye Savino) 712th Guards Fighter Aviation Regiment (Kansk) 790th Fighter Aviation Regiment (Khotilovo/Borisovskiy) 929th V.P. Chkalova State Flight Test Centre (Akhtubinsk) From 131 to 85 MiG-31BM in inventory as of 2020. Deliveries of updated aircraft drawn from older models stocks continue as of 2022. Ten jets have been modified to the MiG-31K version and carry the Kh-47M2 Kinzhal missile as of May 2018. With this modification and with removed APU for air-to-air missiles, the aircraft gained a sole role of an attack aircraft. Russian Naval Aviation 7060th Naval Aviation Air Base (Petropavlovsk-Kamchatskiy/Yelizovo) 10 MiG-31B/BS and 22 MiG-31BM in inventory as of 2020. Former operators Soviet Air Forces aircraft passed to the Russian and Kazakh Air Forces after the