The RD-180 (РД-180, Ракетный Двигатель-180, Rocket Engine-180) is a rocket engine designed and built in Russia. It features a dual combustion chamber, dual-nozzle design and is fueled by a kerosene/LOXmixture. Currently, RD-180 engines are used for the first stage of the US Atlas V launch vehicle.
没有说是俄美合研。