Two former UK prime ministers have led a call for a new international tribunal to be set up to investigate Russian President Vladimir Putin and his allies for their actions in the Russian invasion of Ukraine.

According to The Guardian, Gordon Brown and Sir John Major have pledged their support for the creation of a special forum modeled on the Nuremberg trials.

The most notorious Nazi war criminals were tried for the crime of aggression after World War II.

The UN security council has the power to approve charges of aggression without the approval of the International Criminal Court. Russia is a permanent member of the council.

Theloophole in international law must be closed so that Putin can't dodge accountability, argued Brown in the Daily Mail.

Brown called for the arrest and trial of Putin.

Ukrainian foreign minister Dmytro Kuleba is one of 140 people who signed the proposal.

The petition calling for the Nuremberg-style tribunal had over 750,000 signatures by Saturday morning.

Biden said that Putin is a war criminal.

Evidence of targeted attacks on civilians is growing as the formal investigation into war crimes continues.

According to the United Nations human rights office, at least 832 people were killed and 1,333 were wounded in Ukraine through March 17. The OHCHR said last week that targeting non-combatants can constitute a war crime.