Russian President Vladimir Putin attends a meeting with the head of the Russian Union of Industrialists and Entrepreneurs Alexander Shokhin in Moscow, Russia March 2, 2022. Russian President Vladimir Putin attends a meeting with the head of the Russian Union of Industrialists and Entrepreneurs Alexander Shokhin in Moscow, Russia March 2, 2022. 

President Joe Biden called for evidence to be gathered to put Russian leader Vladimir Putin on trial for war crimes.

On the heels of reports of mass killings of civilians by Russian-controlled troops in the town of Bucha, Biden said of Putin, "He is a war criminal."

This guy is brutal, and what is happening in Bucha is outrageous, and everyone has seen it, Biden told reporters.

I think it is a war crime. He should be held accountable.

Biden said that he plans to slap additional sanctions on Russia for its conduct during the war.

The president told the reporter the nature of the expected sanctions.

US President Joe Biden speaks to reporters upon arrival at Fort McNair in Washington, DC on April 4, 2022.

Ukrainian President Volodymyr Zelenskyy accused Russian forces of committing genocide.

The mayor of the town said that at least 300 people had been killed by fighters from Chechnya.

The Defense Ministry of Russia denied the allegations that its troops killed civilians.

Last month, Biden got criticized for calling Putin a war criminal.

The truth of the matter is that you saw what happened. Biden said that he is a war criminal.

We need to gather the information. The president said that we have to continue to provide the weapons that the Ukrainians need.

This can be a war crime trial if we get all the details.