International law, also known as "law of nations", refers to the body of rules which regulate the conduct of sovereign states in their relations with one another.What are the Sources of international law? , Available at Learning the Law. Also see Definition of international law Sources of international law include treaties, international customs, general widely recognized principles of law, the decisions of national and lower courts, and scholarly writings. They are the materials and processes out of which the rules and principles regulating the international community are developed. They have been influenced by a range of political and legal theories.
The U.S. Department of State lists the "sources of international lawmaking" as including "treaties, executive agreements, legislation, Federal regulations, Federal court decisions, testimony and statements before Congressional and international bodies, diplomatic notes, correspondence, speeches, press conference statements, and even internal memoranda."Digest of United States Practice in International Law 1973 v (Rovine ed. 1974).
Modern views Article 38(1) of the Statute of the International Court of Justice is generally recognized as a definitive statement of the sources of international law. It requires the Court to apply, among other things, (a) international conventions, whether general or particular, establishing rules expressly recognized by the contesting states; (b) international custom, as evidence of a general practice accepted as law; (c) the general principles of law recognized by civilized nations; (d) subject to the provisions of Article 59, judicial decisions and the teachings of the most highly qualified publicists of the various nations, as subsidiary means for the determination of rules of law.
Historic considerations and development During the 19th century, it was recognized by legal positivists that a sovereign could limit its authority to act by consenting to an agreement according to the principle pacta sunt servanda. This consensual view of international law was reflected in the 1920 Statute of the Permanent Court of International Justice, and was later preserved in Article 38(1) of the 1946 Statute of the International Court of Justice.Statute of the International Court of Justice .
The core of broad principles of law is general and dynamic, and they can sometimes be reduced to a proverb or a basic idea. Unlike other types of regulations, such as ordered law or agreements, broad standards of law have not been "established" according to the right sources of law. General norms of law, on the other hand, are regarded as a component of positive law, even if they are only used as auxiliary devices. They define critical principles for the framework's actual operation and, in general, are drafted from the legal executive. General standards of law have been the subject of extensive doctrinal debate in international law, owing to the various connotations attributed to the concept and the hypothetical concerns that they raise. The use of the expression "central standards of international law", which is at the top of the overall set of laws and begins in settlement or custom (e.g., the guideline of sovereign correspondence of states or the rule of the forbiddance of danger or the use of power), and which will not be managed here, causes a lot of confusion. Given the language used in Article 38, paragraph 1(c) of the Statute of the International Court of Justice. ("universal standards of law as recognised by acculturated countries"), the beginning of universal standards of law as applied at the global level has also been a source of debate. The conventional wisdom holds that these standards have their origins in homegrown general systems of laws. Once it is established that some of these broad instruments are frequently shared rules found in domestic systems, they can be utilised in international law as well. They are rational derivations that can be found in any overall group of laws: the standard of restitution for harm committed, the standard of rule understanding, or those used for the purpose of rule struggles—many of them known through Latin adages—are true models. Various general legal standards, such as "audiatur et altera" standards, "actori incumbit onus probandi", or the method that the designated authority of benefits is also judge of the coincidental locale, have been promoted by the legal executive policy is very important of any war.
Hierarchy On the question of preference between sources of international law, rules established by treaty will take preference if such an instrument exists. It is also argued however that international treaties and international custom are sources of international law of equal validity; new custom may supersede older treaties and new treaties may override older custom. Also, jus cogens (peremptory norm) is a custom, not a treaty. Judicial decisions and juristic writings are regarded as auxiliary sources of international law, whereas it is unclear whether the general principles of law recognized by 'civilized nations' should be recognized as a principal or auxiliary source of international law. Nevertheless, treaty, custom, and general principles of law are generally recognized as primary sources of international law.
Treaties
Treaties and conventions are the persuasive source of international law and are considered "hard law". Treaties can play the role of contracts between two or more parties, such as an extradition treaty or a defense pact. Treaties can also be legislation to regulate a particular aspect of international relations or form the constitutions of international organizations. Whether or not all treaties can be regarded as sources of law, they are sources of obligation for the parties to them. Article 38(1)(a) of the ICJ Statute, which uses the term "international conventions", concentrates upon treaties as a source of contractual obligation but also acknowledges the possibility of a state expressly accepting the obligations of a treaty to which it is not formally a party.
For a treaty-based rule to be a source of law, rather than simply a source of obligation, it must either be capable of affecting non-parties or have consequences for parties more extensive than those specifically imposed by the treaty itself.
Thus, the procedures or methods by treaties become legally binding are formal source of law which is a process by a legal rule comes into existence: it is law creating.Martin Dixon, Textbook on International Law (Oxford University Press, 7th ed 2013) 24
Treaties as custom Some treaties are the result of codifying existing customary law, such as laws governing the global commons, and jus ad bellum. While the purpose is to establish a code of general application, its effectiveness depends upon the number of states that ratify or accede to the particular convention. Relatively few such instruments have a sufficient number of parties to be regarded as international law in their own right. The most obvious example is the 1949 Geneva Conventions for the Protection of War Victims.
Most multi-lateral treaties fall short of achieving such a near-universal degree of formal acceptance and are dependent upon their provisions being regarded as representing customary international law and, by this indirect route, as binding upon non-parties. This outcome is possible in a number of ways:
When the treaty rule reproduces an existing rule of customary law, the rule will be clarified in terms of the treaty provision. A notable example is the Vienna Convention on the Law of Treaties 1969, which was considered by the ICJ to be law even before it had been brought into force.Legal Consequences for States of the Continued Presence of South Africa in Namibia (South-West Africa) notwithstanding Security Council Resolution 276 (1970) (Advisory Opinion) ICJ Reports 16 at 47. When a customary rule is in the process of development, its incorporation in a multilateral treaty may have the effect of consolidating or crystallizing the law in the form of that rule. It is not always easy to identify when this occurs. Where the practice is less developed, the treaty provision may not be enough to crystallize the rule as part of customary international law.North Sea Continental Shelf cases, note 6 at 38. Even if the rule is new, the drafting of the treaty provision may be the impetus for its adoption in the practice of states, and it is the subsequent acceptance of the rule by states that renders it effective as part of customary law.North Sea Continental Shelf cases, note 6 at 41. See also Trial of the Major War Criminals before the International Military Tribunal, Vol. 1, Judgment, 171 at 253–4. If a broad definition is adopted of state practice, the making of a treaty would fall within the definition. Alternatively, it is possible to regard the treaty as the final act of state practice required to establish the rule in question, or as the necessary articulation of the rule to give it the opinio juris of customary international law. Convention-based "instant custom" has been identified by the ICJ on several occasions as representing customary law without explanation of whether the provision in question was supported by state practice. This has happened with respect to a number of provisions of the Vienna Convention on the Law of Treaties 1969. If "instant custom" is valid as law, it could deny to third parties the normal consequences of non-accession.
The United Nations Charter Pursuant to Chapter XVI, Article 103 of the United Nations Charter, the obligations under the United Nations Charter overrides the terms of any other treaty. Meanwhile, its Preamble affirms the establishment of the obligations out of treaties and source of international law.
International custom
Article 38(1)(b) of the ICJ Statute refers to "international custom" as a source of international law, specifically emphasizing the two requirements of state practice plus acceptance of the practice as obligatory or opinio juris sive necessitatis (usually abbreviated as opinio juris).
Derived from the consistent practice of (originally) Western states accompanied by opinio juris (the conviction of States that the consistent practice is required by a legal obligation), customary international law is differentiated from acts of comity (mutual recognition of government acts) by the presence of opinio juris (although in some instances, acts of comity have developed into customary international law, i.e. diplomatic immunity). Treaties have gradually displaced much customary international law. This development is similar to the replacement of customary or common law by codified law in municipal legal settings, but customary international law continues to play a significant role in international law .
State practice