Vladimir Putin, Russia’s president, has responded to remarks by his US counterpart that he is a “killer” by repeating a playground ditty that “those in glass houses shouldn’t throw stones”.
Mr Putin, who was speaking to Russian state TV, also pointedly wished Joe Biden the “best of health”.
There have been claims by some Russian critics of Mr Biden, that the 78-year-old is suffering from dementia.
Earlier this week, the US president was interviewed on TV and was asked if he thought the Russian leader was “a killer”. Mr Biden responded: “Yes, I do”, an answer which has enraged Moscow.