Under the previously signed contract, the Russian Federation sent the last batch of RD-180 rocket engines to the USA. NPO Energomash assembled 6 engines for US customers, Roscosmos said.
"Representatives of United Launch Alliance, Pratt&Whitney and RD AMROSS have signed forms for the engines," the state corporation said in a statement.
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It is noted that the contract has been signed for 12 years. During this period, NPO Energomash has supplied the United States with 122 RD-180 engines.
The Russian engine is used on stage 1 of the US Atlas 5 rocket. The USA is going to abandon these engines in a few days.