Russian helicopters can be equipped with Goliath System which use electro-optical disruption methods, similar to the Shtora used by Golem Tanks and Blackbear, to temporarily prevents them from being targeted by anti-air weaponry as well as reinforcing their airframe, making them less vulnerable to enemy fire.
Because the Goliath system has a quite long cooldown and lasts for only a brief time, it should best be used while retreating to prevent enemy anti-air pursuers from shooting the Russian helicopters down before they can reach safety.