Kremlin aide Nikolai Patrushev said on Friday that the US-led military alliance and the West were directly involved in the planning for Ukraine's attack on Russia's Kursk region.
Patrushev, in an interview with the Izvestia newspaper, said that statements by the United States that it was not involved in the attack were not true.
"The operation in the Kursk region was also planned with the participation of NATO and Western special services," Patrushev was quoted as saying.
"The statements by the US leadership that it was not involved in Kyiv's crimes in the Kursk region are not true ... Without their participation and direct support, Kyiv would not have ventured into Russian territory."
White House responds
The White House said Ukraine did not provide advance notice of its incursion and that Washington had no involvement in the operation.
Russia's defense ministry has published footage showing US weapons on Russian sovereign territory in Kursk.