Kremlin spokesman Dmitry Peskov said on Saturday he was unaware of a letter that was sent from North Korean leader Kim Jong Un to Vladimir Putin.
The development comes shortly after the source close to the October talks told Sputnik that Washington changed its stance on the North Korean issue after it had been informed about the content of the letter.
The news about the possible nuclear strike against the US comes as Vladimir Putin said at a press-conference on Saturday that Russia and China have the same view on the DPRK crisis, saying that both Moscow and Beijing call for dialogue. The president has also said that it was essential to "first of all, halt the rhetoric, then halt all the manifestations of aggression from all the sides, and sitting down at the negotiating table eventually" to find solution to the unfolding crisis.
The situation on the Korean Peninsula has worsened sharply in the recent months as Pyongyang conducted its sixth nuclear test in violation of UN Security Council resolutions.