As the most serious war crimes (grave breaches) should not be left unpunished, the 1949 Geneva Conventions contain an unusually worded obligation to either prosecute such a suspected war criminal or to hand him over to another country to be tried there (aut judicare aut dedere in stead of aut dedere aut judicare). Fifty years on, less than one in six of the parties to the Conventions have established universal jurisdiction over grave breaches which is necessary to prosecute a suspect if he was to be found in their country. An assessment and classification of the Conventions, national laws, prosecutions and practical obstacles. But if, what God forbid, these Conventions should ever have to be applied, they must be obeyed.M.W. Mouton, Diplomatic Conference, Geneva 16 July 1949