Russia says US allegations that it ran a hacking campaign to influence the American presidential elections are “reminiscent of a witch-hunt”.
Kremlin spokesman Dmitry Peskov told reporters Moscow was tired of the accusations.
He said a report released by US intelligence agencies detailing the allegations was groundless.
It is the first official reaction from Russia since President-elect Donald Trump received the report on Friday.
The unclassified report contains allegations that Russian President Vladimir Putin had ordered the hacking of Democratic Party emails to damage Donald Trump’s Democrat rival, Hillary Clinton, and influence the election.
In his comments on Monday, Mr Peskov said Russia “categorically denied that Moscow had been involved in any hacking attacks”.
“Groundless accusations which are not supported by anything are being rehearsed in an amateurish, unprofessional way. We don’t know what information they are actually relying on.”
The claims amounted to a “witch-hunt”, he added.
