Since the Nuremberg Trials of top Nazi leaders following the Second World War, international law has affirmed that no-one, whatever their rank or office, is above accountability for their crimes. Yet the Cold War put geopolitical agendas ahead of effective action against war crimes and major human rights abuses, and no permanent system to address impunity was put in place. It was only with the Cold War's end that governments turned again to international institutions to address impunity, first by establishing International Criminal Tribunals to prosecute genocide, war crimes, and crimes...