If peace in Ukraine looks depressingly far away, accountability seems beyond another galaxy.

What are the chances Vladimir Putin will appear in a courtroom to answer for the hell he’s unleashed in Ukraine? They seem vanishingly small.

And yet, national leaders, politicians, international organizations and an army of individuals are working to build the war crimes case against Putin and his regime. The International Criminal Court, the European Court of Human Rights and the International Court of Justice are all investigating crimes committed in Ukraine. Former U.K. prime ministers Gordon Brown and John Major have thrown their support behind an initiative to back a new tribunal.