@sburke @Kinophile
Maj. Alexey Chuprov, probably a Su-25 pilot in the 266th Separate Assault Aviation Regiment, although he may be an officer from another unit stationed at the same airbase:
Col. Ruslan Rudnev, regiment commander, and Lt. Col. Oleg Chervov, deputy commander for flight training, (both already on the list, but maybe without unit) seem to also be noted as losses from the 266th Assault Aviation Regiment.
Maj. Maxim Kovalev, Ka-52 pilot, probably in the 39th Helicopter Regiment:
Lt. Col. Alexander Bolotnikov, 98th Guards Airborne Division: