RD-180 engine mounted on Atlas 5 rocket.

With no domestic demand for Energomash’s premier products — the RD-180 and RD-181 engines — the company faces a potentially daunting gap.

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Brian Berger is editor in chief of SpaceNews.com and the SpaceNews magazine. He joined SpaceNews.com in 1998, spending his first decade with the publication covering NASA. He was named senior staff writer in 2004, a position he held until being named...