International Criminal Responsibility for Supporting Terrorism with emphasis on the Responsibility of Senior Government Officials

International regulations and procedures confirmed two main points; a comprehensive fight against terrorism and prohibition of any interaction with terrorist groups. But nowadays, some political necessities have caused states’ extensive interaction with terrorist groups behind the scenes. This is a driving factor in recognizing the responsibility of states for their roles and responsibilities in the international society against other actors. In this research, in addition to analysis the theoretical foundation of responsibility of legal persons (states leaders), we have briefly overviewed general responsibilities of states with the respect to terrorism phenomenon, and viewed the supplementary and specific responsibilities of states in the form of the doctrine of responsibility to protect against other actors of international relations. Considering the threat of these groups to international peace and security and international prohibitions, we have also reviewed moral and material supports of terrorism by some leaders and states. This situation made us to understand criminal responsibility of leaders considering all the existing restrictions, and the ability of authentication of their criminal liability and the design of this responsibility for crimes against humanity and war crimes that are available in Articles 7 and 8 of the Statute of the International Criminal Court.