Dynamics of International Alliances in an Era of Tension In an era of ever-increasing geopolitical tensions, the dynamics of international alliances have become very complex. Various big powers such as the United States, China and Russia compete to influence the world order. These changes encourage small countries to reconsider their alliance strategies to achieve security and stability. One of the key aspects of international alliances is the need to address common threats. An example is NATO cooperation, which continues to adapt to new challenges such as terrorism and cyber attacks. Even though there are differences in views among its members, the commitment to maintaining collective security remains the main pillar. On the other hand, China’s approach to international alliances is characterized by the Belt and Road initiative, which encourages closer economic partnerships with countries in Asia, Africa and Europe. This not only aims to expand geopolitical influence, but also to help developing countries build infrastructure. However, some countries worry about over-dependence on Beijing. Russia, on the other hand, seeks to reestablish influence in former Soviet territories through alliances such as the Collective Security Treaty Organization (CSTO). Tensions between Russia and the West, especially in the context of Ukraine, are forcing countries in the region to choose sides. This uncertainty creates new dynamics in deeper regional alliances. Southeast Asian countries are also showing sophistication in alliance strategies. ASEAN, although motivated by the principle of non-intervention, is trying to increase security cooperation amidst increasing tensions in the South China Sea. This initiative includes multilateral dialogue to prevent conflict and build trust between parties. Bilateral alliances, such as the partnership between Japan and the United States, play an important role in maintaining stability in East Asia. As the threat from North Korea increases, the two countries are increasing defense and intelligence cooperation, demonstrating the importance of traditional alliances in facing new challenges. Climate change, global health, and cyber security are also a focus in international alliance dynamics. In this context, multilateralism becomes important. Forums such as the G20, G7 and UN seek to bridge differences between large and small countries to reach common solutions. Finally, shifts in international alliance dynamics demonstrate the need for constant adaptation. Countries must evaluate their priorities and build cooperation that is more flexible and responsive to changes in the global environment. A foreign policy based on inclusive multilateralism will be key to reducing tensions and building a more peaceful future.