U.S. President Joe Biden called for a trial to take place against Kremlin leader Vladimir Putin and Russian forces following reports of Russian atrocities in Bucha, and added he was looking into additional sanctions against Russia.

“You saw what happed in Bucha,” he told journalists on Monday

Biden called the actions of the Russians “brutal”, and the Kremlin leader – a “war criminal.”

“I think it is a war crime … He [Putin] should be held accountable,” he said.

The U.S. president also said he plans to impose additional sanctions on Russia over the brutal war it has been waging in Ukraine since February 24.

Russian atrocities in Bucha: Biden calls for war crimes trial

At the same time, he stressed the need to continue strengthening Ukraine’s defense capabilities.

“We have to continue to provide Ukraine with the weapons they need to continue the fight and we have to get all the details so this can be an actual — have a war crime trial,” Biden said.

On February 24, Russian President Vladimir Putin announced the beginning of a full-scale invasion of Ukraine. Russian troops have been shelling and destroying key infrastructure facilities, conducting massive shelling of residential areas of Ukrainian cities and villages using artillery, multiple rocket launchers and ballistic missiles.

Martial law was imposed in Ukraine and general mobilization was announced.