Diplomatic relations play a very vital role in building international cooperation. Through diplomacy, countries can establish effective communication, establish agreements, and overcome various global issues. One key aspect of diplomatic relations is diplomatic missions, where ambassadors and other envoys act as representatives of their countries to facilitate dialogue and cooperation. First, diplomatic relations allow transparent exchange of information between countries. Through official communication channels, countries can share relevant data and analysis, enhancing shared understanding of global challenges. For example, on the issue of climate change, countries can work together to reduce carbon emissions, relying on the dissemination of accurate scientific data from each country’s foreign ministry. In addition, international agreements resulting from diplomatic relations often lead to cooperation in the economic field. Countries can develop mutually beneficial trade agreements, create investment opportunities, and open new market access. For example, cooperation in the field of trade between ASEAN member countries allows them to increase competitiveness and economic growth in the region. Diplomacy also plays an important role in creating political stability and regional security. Countries often establish international and regional organizations, such as the United Nations or NATO, to address security issues. Through meetings and discussions, countries can avoid conflict, support each other in law enforcement, and collaborate in maintaining peace. Furthermore, the cultural aspect in diplomatic relations cannot be ignored. Cultural diplomacy helps strengthen relations between countries through the exchange of arts, education, and values. Programs such as international scholarships or art exhibitions can promote cross-cultural understanding, which in turn supports broader collaboration. Then, in the context of global health, health diplomacy becomes increasingly important. Countries must collaborate to deal with pandemics and other health problems. A concrete example is cooperation in vaccine research and distribution during the COVID-19 crisis. Countries that have strong diplomatic relations can more easily coordinate efforts to provide vaccines and medical resources. Private sector involvement is also very important in building international cooperation through diplomatic relations. Multinational companies can act as bridges between countries by facilitating investment and business development. Good diplomatic relations will create a conducive climate for economic growth, which in turn can benefit people on both sides. Furthermore, the importance of publications and communication strategies in diplomacy cannot be ignored. Countries often use social media and digital platforms to convey messages to a global audience. Effective communication strategies help in building a positive image and increasing the soft power of a country on the international stage. Finally, diplomatic relations serve as a foundation for countries to contribute to sustainable development. International collaboration in achieving sustainability goals, such as the Sustainable Development Goals (SDGs), relies heavily on productive dialogue between countries, enabling faster transfer of technology and innovation. Through these various aspects, it is clear that the role of diplomatic relations in building international cooperation is very essential. Effective diplomacy is not just about negotiation but also about building trust, which is a key factor in creating mutually beneficial and sustainable collaboration in various fields.