Russian engineering corporation Energomash sold rocket engines to the United States at half production cost, losing $32 million as a result, the Russian Comptroller's Office said on Wednesday.

It did not say how many RD-180 engines were sold, only saying the loss was sustained in 2008-09, constituting 68 percent of the firm's total losses.

Energomash develops and manufactures the majority of rocket engines for Russian booster rockets.

It supplies RD-180 engines to the United States for Atlas V launching systems.