The Kremlin spokesman, Dmitry Peskov, dismissed reports Vladimir Putin is suffering from ill health.
Mr Peskov claimed the Russian President is fit and well and dismissed as an "absurd hoax" the suggestion that the leader is using body doubles for public appearances.
This denial comes after a Russian Telegram channel, General SVR, alleged Putin suffered on Sunday evening a "cardiac arrest" in his private home in Moscow.
This unverified report, which was picked up not just in Russia but also by some Western media, alleged doctors were called immediately after the country's leader was found lying on the floor.
The report went on to allege Putin was then moved to a special medical facility built in the apartment, where he underwent intensive care.
The Telegram channel had previously alleged Putin is suffering from ill health, and claimed a Putin lookalike was deployed by the Kremlin to undertake a recent trip to China.
During that official visit, Putin held meetings with Chinese President Xi Jinping and Hungarian Prime Minister Viktor Orban among others.
He also attended the Belt and Road summit, marking the 10th anniversary of the Chinese initiative.
