同样重要的是补充性原则。必须强调，只有在有关国家不能或不愿起诉被控犯下国际社会关切的最严重罪行的人时，才援引国际刑院的管辖权。
Of equal importance is the principle of complementarity. It is important to emphasize that the ICC’s jurisdiction is only invoked when States are unable or unwilling to prosecute those accused of committing the most serious crimes of concern to the international community.