How did the tribunals for the former Yugoslavia and Rwanda contribute to international criminal law?

The establishment of the International Criminal Tribunal for the former Yugoslavia (ICTY) and the International Criminal Tribunal for Rwanda (ICTR) by the United Nations Security Council in the 1990s marked a pivotal revival of international criminal justice, nearly 50 years after the Nürnburg and Tokyo trials.12

These tribunals contributed significantly to the development of international criminal law in several key ways:

• Individual Accountability: They reinforced the principle that official status, including that of a head of state, does not grant immunity from prosecution. This was exemplified by the indictment and arrest of Slobodan Milošević.1
• Defining Crimes: The tribunals were instrumental in formalizing the prosecution of crimes against humanity, genocide, and war crimes, and they were among the first international bodies to formally recognize sexual violence—such as rape—as a war crime.1
• Command Responsibility: They upheld the doctrine of command or superior responsibility, ensuring that military and civilian leaders could be held liable for crimes committed by their subordinates.1
• Precedent for the ICC: The urgency and legal frameworks established by these ad hoc tribunals directly influenced the creation of the International Criminal Court and the adoption of the Rome Statute, which expanded the scope of international law to cover crimes committed during internal armed conflicts.324