The Hittite version of the Treaty of Kadesh, among the earliest extant examples of an international agreement.
Members of the United Nations
1943 sketch by Franklin Roosevelt of the UN original three branches: The Four Policemen, an executive branch, and an international assembly of forty UN member states
The UN in 1945: founding members in light blue, protectorates and territories of the founding members in dark blue
Dag Hammarskjöld was a particularly active secretary-general from 1953 until his death in 1961.
Kofi Annan, secretary-general from 1997 to 2006
Flags of member nations at the United Nations Headquarters, seen in 2007
Mikhail Gorbachev, Soviet general secretary, addressing the UN General Assembly in December 1988
Colin Powell, the US Secretary of State, demonstrates a vial with alleged Iraq chemical weapon probes to the UN Security Council on Iraq war hearings, 5 February 2003
Current secretary-general, António Guterres
The ICJ ruled that Kosovo's unilateral declaration of independence from Serbia in 2008 did not violate international law.
Under Sukarno, Indonesia became the first and only country to leave the United Nations.
A Nepalese soldier on a peacekeeping deployment providing security at a rice distribution site in Haiti during 2010
The UN Buffer Zone in Cyprus was established in 1974 following the Turkish invasion of Cyprus.
Eleanor Roosevelt with the Universal Declaration of Human Rights, 1949
Three former directors of the Global Smallpox Eradication Programme reading the news that smallpox has been globally eradicated in 1980
In Jordan, UNHCR remains responsible for the Syrian refugees and the Zaatari refugee camp.
The 2001 Nobel Peace Prize to the UN—diploma in the lobby of the UN Headquarters in New York City
Marking of the UN's 70th anniversary – Budapest, 2015

It may be argued that the practice of international organizations, most notably that of the United Nations, as it appears in the resolutions of the Security Council and the General Assembly, are an additional source of international law, even though it is not mentioned as such in Article 38(1) of the 1946 Statute of the International Court of Justice.

- Sources of international law

The ICJ's rulings are binding upon parties and, along with its advisory opinions, serve as sources of international law.

- United Nations

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Emblem of the International Court of Justice

International Court of Justice

Emblem of the International Court of Justice
The Peace Palace in The Hague, Netherlands, seat of the ICJ
Audience of the "Accordance with International Law of the Unilateral Declaration of Independence by the Provisional Institutions of Self-Government of Kosovo"

The International Court of Justice (ICJ; Cour internationale de justice; CIJ), sometimes known as the World Court, is one of the six principal organs of the United Nations (UN).

The ICJ is the only international court that adjudicates general disputes between countries, with its rulings and opinions serving as primary sources of international law.

The Hittite version of the Treaty of Kadesh, among the earliest extant examples of an international agreement.

International law

Set of rules, norms, and standards generally recognized as binding between nations.

Set of rules, norms, and standards generally recognized as binding between nations.

The Hittite version of the Treaty of Kadesh, among the earliest extant examples of an international agreement.
Hugo Grotius' De jure belli ac pacis, is considered one of the foundational texts of international law. (Pictured is the title page from the second edition of 1631).
A portrait of the Dutch jurist Hugo Grotius (alias Hugo de Groot)
Sir Alberico Gentili is regarded as the Father of international law.
The First Geneva Convention (1864) is one of the earliest formulations of international law

The sources of international law include international custom (general state practice accepted as law), treaties, and general principles of law recognized by most national legal systems.

The Second World War accelerated this development, leading to the establishment of the United Nations, whose Charter enshrined principles such as nonaggression, nonintervention, and collective security.