Variants of the RD-170 are still in use today on such vehicles as the Zenit 3SL used by Sea Launch. The modern Soyuz rocket uses updated versions of the RD-107 and RD-108 engines. The RD-180 engine, developed with Pratt & Whitney Rocketdyne through the RD AMROSS partnership, is a direct descendant of the RD-170 line and is used as the propulsion system for the first stage of Atlas V. The most current engine listed on the NPO Energomash website is the single-chamber RD-191, developed for the Angara and Baikal launch vehicles.