In response to the US president calling Mr Putin a "crazy SOB", the Kremlin has accused Mr Biden of making a poor attempt at appearing like a "Hollywood cowboy", Paralel.Az reports citing Sky News.

"The use of such language against the head of another state by the president of the United States is unlikely to infringe on our president, President Putin," Kremlin spokesman Dmitry Peskov said.

"But it debases those who uses such vocabulary."

He said the remark was "probably some kind of attempt to look like a Hollywood cowboy. But honestly I don't think it's possible."

"Has Mr Putin ever used one crude word to address you? This has never happened. Therefore, I think that such vocabulary debases America itself."