Which formal declaration on the laws of war dealt with the prosecution of war crimes?

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The Nuremberg and Tokyo tribunals were established after World War II to prosecute war crimes committed by Axis countries. They established the principle that individuals could be held responsible for war crimes and crimes against humanity, even if they were acting on behalf of a government or military. This became a foundational principle of international law, and subsequent international tribunals have built upon the precedent set by the Nuremberg and Tokyo trials. The Hague and Geneva Conventions both established rules for the conduct of war, but did not specifically address the prosecution of war crimes. The UN Charter lays out principles governing international relations, but does not deal specifically with war crimes.

Which Formal Declaration on the Laws of War Dealt with the Prosecution