US President Joe Biden said on Friday that Russian President Vladimir Putin has clearly committed war crimes and the International Criminal Court's (ICC) decision to issue an arrest warrant for him was justified.

"He's clearly committed war crimes," Biden told reporters, referring to Putin.

"Well, I think it's justified," Biden added, referring to the warrant. "But the question is - it's not recognized internationally by us either. But I think it makes a very strong point."

"There is no doubt that Russia is committing war crimes and atrocities (in) Ukraine, and we have been clear that those responsible must be held accountable," the spokesperson added.

"This was a decision the ICC prosecutor reached independently based on the facts before him."