[avmich]

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.

[qaq]

The engine is not unique to Mria it was used on AN-124 and Motor Sich has a modernised version going through testing Д-18ТМ so should not be any issues on that front