Hydrogen engines for Energiya, RD-0120, were made in Voronezh by KBKhA, which is still producing rocket engines. However this particular engine is practically l

Hydrogen engines for Energiya, RD-0120, were made in Voronezh by KBKhA, which is still producing rocket engines. However this particular engine is practically lost - can't be recreated without extensive R&D program. It's not enough to have the original manufacturer survive... Can Rocketdyne manufacture another F-1 today? So it's quite possible - though not certain - that Motor Sich wouldn't be able to create a unique enough engine, even if it did that in the past.