An influential aide to Russian President Vladimir Putin said on Friday that the West and the U.S.-led NATO alliance had helped to plan Ukraine's surprise attack on Russia's Kursk region, something Washington has denied, Paralel.Az reports citing Reuters.

The lightning incursion, the biggest into Russia by a foreign power since World War Two, began on Aug. 6 when thousands of Ukrainian troops crossed Russia's western border in a major embarrassment for Putin's military.

Influential veteran Kremlin hawk Nikolai Patrushev dismissed the Western assertions in an interview with the Izvestia newspaper.

"The operation in the Kursk region was also planned with the participation of NATO and Western special services," he was quoted as saying, without offering evidence.

"Without their participation and direct support, Kyiv would not have ventured into Russian territory."