The Japanese government said that Japan was not a signatory to the 1929 Geneva Convention on Prisoners of War, although it was the signatory of the 1907 Hague Convention, which provided humane treatment of prisoners of war (POWs), and the 1929 Geneva Convention on the Sick and Wounded Armed Forces in the Field, which provided humane treatment for enemy combatants who were injured, sick, or any other causes in the battlefield. It also signed the Kellogg-Briand Pact in 1929, thereby rendering its actions in 1937–45 liable to charges of crimes against peace, a charge which was introduced at the Tokyo Trials to prosecute Class-A War Criminals. (Class-B War Criminals are those found guilty of war crimes "per se", and Class-C War Criminals are those guilty of crimes against humanity.) However, any convictions for such crimes are not required to be recognized by the Japanese government, as the Kellogg-Briand Pact did not have an enforcement clause stipulating penalties in the event of violation.