According to the Moscow Armistice, signed by Finland and the victorious Allies, mainly the Soviet Union, the Finns were to try those who were responsible for the war and those who had committed war crimes. The Soviet Union allowed Finland to try its own war criminals, unlike other losing countries of the Second World War. The Finnish parliament had to create ex post facto laws for the trials, though in the case of war crimes the country had already signed the Hague IV Convention. In victorious Allied countries war-crime trials were exceptional, but Finland had to arrange full-scale investigations and trials, and report them for the Soviet Union.