The story
Voronezh Mechanical Plant started as a diesel engine manufacturing plant, and has been the plant that serially manufactures the engines designed by Chemical Automatics Design Bureau (KBKhA). In later years, it has branched into producing oil and gas products like valves, manifolds and fittings.
In January 2017, Roscosmos announced that firing tests revealed problems with the Voronezh-produced Proton rocket upper stage engines. According to the investigation, expensive alloys had been replaced by cheaper less heat-resistant alloys. Voronezh director-general Ivan Tikhonovich Koptev resigned.
On November 1, 2019, enterprises ВМЗ and the Chemical Automatics Design Bureau were merged.
From Wikipedia’s article on Voronezh Mechanical Plant, shared under CC BY-SA 4.0.3