Because of what happened in Bucha Biden says that Putin is a "war criminal" and calls for his trial

US President Joe Biden on Monday called for Russian President Vladimir Putin to be brought to justice for what he called "war crimes" and said he planned to seek more sanctions against Moscow after reports of atrocities in Ukraine.

US President Joe Biden on Monday called for his Russian counterpart Vladimir Putin to be tried for "war crimes" in Ukraine, vowing to toughen sanctions against Moscow.

This comes against the background of reports that Russian forces committed atrocities against civilians in the areas they withdrew from in the outskirts of the Ukrainian capital, Kyiv.

"You saw what happened in Bucha (a region near Kyiv)," Biden said in a statement to reporters, adding: "Putin is a war criminal," according to the Associated Press of America.

The US president called for Putin to be brought to justice for "war crimes (committed by his country's forces)", and said he would seek "to impose more sanctions following the reported atrocities in Ukraine," according to the US agency.

A mass grave and bound bodies of people shot at close range were discovered in Bucha, outside Kyiv, a town retaken by Ukrainian forces from Russian forces, apparently prompting the United States and Europe to impose additional sanctions on Moscow.

"We have to gather information," Biden said. "We have to continue to provide Ukraine with the weapons it needs to keep fighting. And get all the details so that this is an actual war crimes trial."

Biden added, "Putin is brutal, and what is happening in Bucha is outrageous and everyone has seen it."

The Kremlin has categorically denied any accusations of killing civilians, including in Bucha, saying that Ukraine orchestrated the incidents of graves and bodies to discredit Russia.