International law differs from state legal systems in that it applies primarily – but not exclusively – to countries and not to individuals, and operates largely by consent, since there is no universally recognized authority to impose it on sovereign states. Therefore, States may choose not to respect international law and even break a treaty.  However, such violations, in particular of customary international law and peremptory norms (jus cogens), can be countered by coercive measures ranging from military intervention to diplomatic and economic pressure. Elements of the naturalist and positivist schools were synthesized, mainly by the German philosopher Christian Wolff (1679-1754) and the Swiss jurist Emerich de Vattel (1714-67), both of whom sought common ground in international law. During the 18th century. In the nineteenth century, the positivist tradition gained wider acceptance, although the concept of natural rights remained influential in international politics, especially through the Republican revolutions of the United States and France. It was not until the 20th century that natural rights took on increased importance in international law. (1) Direct inclusion of the rights recognized in the international instrument in what may be called the “Bill of Rights” in the national legal order. (b) international agreements which are not binding, such as declarations and regulations, and which are relevant for the interpretation of international standards and their transposition into national law. The first three of these sources are recognized as the most important and established sources of international law. However, some states, academics and lawyers point out that court decisions, ICJ opinions and UN General Assembly resolutions (often classified as “soft law”) are increasingly influencing the development of the law. In particular, it is argued that they play a role in the establishment of customary international law. For example, ICJ rulings that certain treaty provisions of international humanitarian law have the status of customary international law have sometimes obliged states that are not parties to the treaty to comply with their obligations (Alvarez-Jiménez, 2011).
In addition, in its 1996 opinion on the legality of the threat or use of nuclear weapons, the ICJ noted that General Assembly resolutions, while not binding, may provide evidence to establish the existence of a rule or the emergence of an opinio juris necessary for international practice (Prost and Clark, 2006). Three main methods are available for translating international legal instruments into domestic law: The law of the sea is the domain of international law with respect to the principles and rules by which States and other entities interact in ocean affairs.  It covers areas and issues such as navigation rights, marine mineral rights and responsibility for coastal waters. The law of the sea differs from admiralty law (also known as the law of the sea), which concerns the relations and conduct of private entities at sea. The existence of various disciplines and sources of international law relevant to humanitarian protection and humanitarian assistance results in a comprehensive framework applicable to a range of circumstances. International humanitarian law has laid the foundation for fundamental humanitarian principles such as humanity and impartiality. In this way, it can provide insight into or give weight to the principles of humanitarian assistance on which humanitarian actors are based. These actors include not only direct aid providers, but also local groups and communities working for better support. (3) Automatic implementation of international legal instruments in the national legal order. The term “international law” is sometimes divided into “public” and “private” international law, especially by civil law scholars who want to follow a Roman tradition.
 Roman jurists had also distinguished between ius gentium, the law of nations, and ius inter gentes, agreements between nations. From this point of view, it is said that “public” international law covers relations between nation-states and includes areas such as contract law, maritime law, international criminal law, martial law or international humanitarian law, international human rights law and refugee law. In contrast, “private” international law, more commonly referred to as “conflict of laws”, is about whether the courts of countries claim jurisdiction over foreign-related cases and which law of the country is applicable.  `Treaty` means an international agreement concluded in writing between States and governed by international law, whether established in a single act or in two or more interconnected instruments and whatever its particular name”. Translating an international convention, norm or standard into national law and then into local implementation is slow and complex, but fundamental. States have the primary responsibility for changing legislative, administrative and judicial practices in order to empower persons with disabilities to exercise their rights. States that have become parties to an international convention are legally obliged to apply the provisions of the Convention in their national jurisdiction. International law leaves it to States to take such legislative and other measures in accordance with their constitutional procedures in order to fulfil their obligations to implement and to ensure that any person whose rights or freedoms are violated has an effective remedy that can be justified before independent and impartial tribunals. Until the middle of the 19th century, relations between states were dictated mainly by treaties, agreements between states to behave in a certain way, unenforceable except by force and non-binding, except as matters of honor and loyalty. One of the first instruments of modern international law was the Lieber Code of 1863, which regulated the conduct of U.S. forces during the American Civil War and is considered the first written recitation of the rules and articles of war observed by all civilized nations. This led to the first war crimes charge, in which a Confederate commander was tried and hanged for holding prisoners of war in cruel and depraved conditions in Andersonville, Georgia.
In the years that followed, other States committed themselves to restricting their conduct, and many other treaties and bodies were created to regulate the conduct of States among themselves, including the Permanent Court of Arbitration in 1899 and the Hague and Geneva Conventions, the first of which was adopted in 1864. In addition to the natural tendency of a State to respect certain norms, the power of international law comes from the pressure that States exert on each other to behave consistently and fulfil their obligations. As with any legal system, many violations of obligations under international law are overlooked. If this is resolved, it can be done through diplomacy and consequences on the reputation of a offending state, submission to international judicial decisions, arbitration, sanctions, or violence, including war.  While violations may indeed be common, states try to avoid the appearance of having ignored international obligations. States may also unilaterally impose sanctions on each other, such as the severance of economic or diplomatic relations or through mutual measures. In some cases, national courts may render a judgment against a foreign State (the field of private international law) for violation, although this is a complex area of law in which international law overlaps with national law. The sources of international law have been influenced by a number of political and legal theories. During the 20th century, legal positivists recognized that a sovereign state could limit its power to act by accepting an agreement based on the principle of the pacta sunt servanda treaty. This consensual view of international law was reflected in the Statute of the Permanent International Court of Justice of 1920 and remains in Article 7 of the STATUTE of the ICJ.
 The sources of international law applied by the international community are listed in Article 38 of the Statute of the International Court of Justice, which is considered authoritative in this regard: in contrast, positivist authors such as Richard Zouche (1590-1661) in England and Cornelis van Bynkershoek (1673-1743) in the Netherlands have argued that international law is based on actual state practice rather than christian or Greco-Roman sources. should be derived.. .