It is wrong to say that Russian military hardware is useless, rather it is the incompetence of the operator which renders any military hardware, useless.
As history testifies that Vietnam defeated the mighty american military, using Russian military hardware.
Serbians managed to shoot down the much touted american stealth bomber, F-117 Nighthawk and an F-16 using non-Western military hardware.
Russia knocked an american U-2 spy plane outta the sky too.
indians had british Hunter fighters which they used in the 1965 War. Yet they were defeated by a smaller Air Force.
Russian military hardware is among the best in the world, without a doubt. As are military hardwares from other countries. "It's not the weapon itself, rather the man behind the machine which counts," as one of the prolific Pakistani Fighter Pilot was once quoted.