Oh my God.

Russian air-defense training went sideways when a YakB-12.7 nearly cut the instructor standing beside it in half.

The reason is pure Russian engineering theater.

Someone mounted a helicopter machine gun, reportedly generating around 1.4 tonnes of recoil force, on a rotating turret with the barrel offset from the turret’s axis. So when the gun fired, the recoil didn’t just push backward. It also tried to spin the entire mount.

The YakB-12.7 was designed for the Mi-24 Hind’s USPU-24 chin turret, where the aircraft absorbs and controls those forces.

Bolting it onto a homemade ground mount without respecting the geometry was always going to end badly.