The Kremlin has mocked Joe Biden after the 46th President accidentally mixed up Volodymyr Zelensky and Vladimir Putin. Biden, 81, who is under growing pressure to stand aside ahead of November 5, provoked audible gasps at the Nato summit in Washington DC on Thursday. The slip-up, which the US President later corrected, featured prominently on bulletins across Russia. Moscow’s Foreign Ministry spokeswoman Maria Zakharova published a sarcastic update in which she mocked previous claims about Russia influencing America’s democratic process. She said: “It seems to me that the notorious ‘Russian in…