About this Speedrun: I used grenade for open the gates to save time, then I switch on the fuel pump to fill the helicopter (then the game triggered the last objective scene due to which Priboi starts coming), I killed both guards near the fuel pump to prevent them from switching it off and then I reached to Priboi's Ammo store and obtained ammo for machine gun for next mission in which machine gun used to fire at enemies from helicopter.

Target time: 20 Minutes. Time taken: 03 Minutes 58 Seconds.