The agreement between Moscow and Washington stipulating the delivery of 101 RD-180 rocket engines to the United States and estimated at about $1 billion was signed in 1997. About 18 months ago ...

"Until 2019 inclusive, Energomash will deliver another 20 RD-180 engines to the United States for their use as the first stages for the Atlas V carrier rocket," the company said in a statement.

The rocket in question was driven by a powerful ... Shortly thereafter, work began on a new engine, the RD-180. It would be twice as big as the NK-33, with five times the thrust of a jumbo jet.

and the Delta Heavy with the new Vulcan rocket. The Atlas series uses Russian-made RD-180 engines. Vulcan uses American-made hardware, including Blue Origin and Aerojet Rocketdyne engines.