The Ministry of Atomic Energy of Russia has refuted the reports by some mass media on cooperation between Russia and the USA in the development of spacecraft with nuclear power units for the purposes of anti-missile defence. As the information of the Atomic Energy Ministry's department for interaction with the bodies of state authority and information policy, received by RIA Novosti, says, some mass media reported that "during the visit of Atomic Energy Minister Alexander Rumyantsev to the USA an accord was allegedly reached on cooperation between Russia and the USA in developing spacecraft with nuclear power units for the anti-missile defence purposes and on deliveries of 'highly-enriched uranium-238' from Russia to the USA for these purposes." "This information contradicts reality," the document stresses. As the Atomic Energy Ministry officials noted, "an accord on deliveries by Russian enterprises of a plutonium 238 isotope which is used for making on-board sources of energy of civil space vehicles was reached" during Rumyantsev's visit. Implementation of the accord is of commercial and scientific interest for both sides, the Ministry officials emphasized. Such deliveries of a plutonium 238 isotope were carried out earlier, too, but were discontinued, and for this reason the matter concerns only resumption of cooperation between Russia and the USA in this field, the press service of the Russian Atomic Energy Ministry noted.