US president, Joe Biden has labelled Russian leader, Vladimir Putin a “war criminal” in a move likely to escalate diplomatic tensions even further.
Mr. Biden delivered the remark off-the-cuff in response to a reporter’s question at the white house.
It is the first time he has used such language to condemn president Putin and the white house later said he was “speaking from his heart”.
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The kremlin spokesman, Dmitry Peskov however, said calling Putin a war criminal was unacceptable and unforgivable on the part of the head of a state, whose bombs have killed hundreds of thousands of people worldwide.
It came after a busy day of political theatre in both the US and Russia over Ukraine.
On the other side of the world, Putin also gave a televised speech laden with anti-western rhetoric.
He accused the west of trying to divide Russia with lies, and railed against those he called “traitors” inside of Russia.