The founding of the United Nations 80 years ago was a remarkable event in human history. The UN aims to maintain international peace and security and develop friendly relations among nations based on respect for the principles of equal rights and the self-determination of peoples. It was under the guidance of the international law based on the UN Charter that countries pursue their development within a global framework, and developing nations gained unprecedented opportunities for growth.

First, the post-World War II international order institutionalized international relations by establishing a series of global organizations, including the UN, where major issues can be discussed, and all member states enjoy equal rights in the General Assembly. The decision to create the UN was agreed upon by the leaders of the anti-fascist allies at the Yalta Conference in February 1945, setting the basic framework for the post-war international order. Second, rules were set for behaviors of countries. Economic globalization increased interdependence among nations, necessitating common rules of behavior. International law was widely recognized and followed in the post-war era, with institutions such as the International Court of Justice playing a crucial role in resolving international disputes. Various international organizations emerged and took on the responsibility of shaping rules through negotiations, most notably the establishment of the World Trade Organization. Third, the post-war international order led to the multipolarity of international politics. Although the Cold War era was characterized by the United States-Soviet Union bipolar structure, the rise of developing nations gradually fostered a multipolar trend in global politics, typified by the South-South cooperation and the Non-Aligned Movement.

Finally, the scope of international cooperation expanded. The active participation of countries in various forms of international collaboration proved critical in addressing complex global challenges such as environmental protection, climate........

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