Principles of International Law: The special edition for the State of Qatar by Faisal Al-Habbabi

International law organizes the rules that govern relations between states, and those in which international organizations are a party; and it defines the standards of the state and the conditions that must be met for it to be considered a person of its persons. In addition to the state, international organizations have appeared as another person of international law. Accordingly, international organizations have the capacity to conclude international treaties, exchange diplomatic missions – for example – with states. International legal rules trace back to main sources; such as international custom and international treaties primarily, in addition to other secondary sources, such as principles of justice and fairness, general principles of law, court rulings, international jurisprudence, and others. International custom is a traditional source of international law, represented by consistent international conduct in a specific pattern, accompanied by a sense of its obligatory nature. As for treaties, their provisions are governed by international custom, and the Vienna Convention on the Law of Treaties 1969 includes provisions related to their conclusion stages and substantive conditions, passing through provisions on reservations to texts and their interpretation, up to methods of termination or suspension of their provisions. Both treaties and international customs address a number of topics concerned with the international community and its safety; such as international humanitarian law, human rights, diplomatic immunities, treaty law, provisions of international responsibility, and dispute resolution.