Putin left raging as Kremlin lashes out at Joe Biden for attack on Russian President

Speaking to donors, the US President used the acronym for "son of a b***h", saying: “We have a crazy SOB like that guy Putin and others, and we always have to worry about nuclear conflict, but the existential threat to humanity is climate.”

In response, Kremlin spokesman Dmitry Peskov said: “Has Mr Putin ever used one crude word to address you? This has never happened. Therefore, I think that such vocabulary debases America itself.”

He also slammed Biden for trying to appear as a “Hollywood cowboy” and said the President’s remarks were a “huge shame for the country [the US] itself”.

The Russian-state news agency Tass quoted Peskov as saying: “Biden's words about Putin cannot hurt the Russian president, but they are a disgrace to the United States itself.”

Peskov added it was "unlikely to infringe on our president, President Putin. But it debases those who use such vocabulary".

The remarks come less than a week after Biden, amongst many other Western leaders, accused Putin of murdering political rival Alexei Navalny.

“We don't know exactly what happened, but there is no doubt that the death of Nalvany was a consequence of something that Putin and his thugs did,” Biden said at the White House.

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It has been reported he died after a walk at the "Polar Wolf" Arctic penal colony where he was serving a three-decade sentence.

Biden said: “Like millions of people around the world I’m literally both not surprised and outraged by the news. He bravely stood up to the corruption the violence and all of the bad things the Putin government was doing.

“In response, Putin had him poisoned. He had him arrested. He had him prosecuted for fabricated crimes. He sentenced him to prison. He was held in isolation. Even all that didn’t stop him from calling out Putin’s lies. Even in prison, he was a powerful voice of the truth.”

Rishi Sunak has confirmed the UK and its allies are “considering all options” to hold Russia and Putin to account after the death of Navalny.

He made the comments during a session of Prime Minister’s Questions on Wednesday 21 February.

“[Navalny] died for a cause to which he dedicated his whole life - freedom,” Sunak said.

He called Navalny’s decision to return to Russia “one of the most courageous acts of our time”.

Sunak also spoke with European Commission President Ursula von der Leyen about the death of one of Putin’s fiercest critics.

A Downing Street spokesperson said: “The Prime Minister and President Von der Leyen expressed their outrage at the death of Alexei Navalny, and underscored the utmost importance of holding those responsible within the Russian system to account.”