Regarding means and instruments of control, states must agree on cooperative measures, mutual assistance in enforcement, and the exchange of data on organizations involved in criminal conduct. Other areas of importance in the regulation of international terrorism are domestic legislation and enforcement, judicial assistance, cooperative enforcement arrangements, intelligence exchange arrangements, status of forces agreements, international standards and regulations, international crimes conventions, amendment of existing agreements, international commissions, and declarations of basic relations. The effective legal regulation of international terrorism requires that states adopt common policies and standards for distinguishing legal and illegal uses of force; agree that organized groups must not be used as proxy, surrogate, or private armies, or as instruments of their policy; recognize at what point the violence of an organized group reaches beyond domestic rebellion to civil war; and implement the commitments undertaken under the United Nations Charter.