Not much of an impact. ULA is pretty much done with RD-180 engines (they have a handful sitting in a warehouse, but weren't planning on buying any more). North

Not much of an impact. ULA is pretty much done with RD-180 engines (they have a handful sitting in a warehouse, but weren't planning on buying any more). Northrop might have a hard time if they plan on launching more Antares rockets, but it's already a pretty low volume launch vehicle, and IIRC it used to use a non-Russian engine anyways.