The development of global security issues has continued to experience significant changes in recent years, triggered by various complex factors involving geopolitics, cyber security and environmental challenges. In the midst of tensions between large countries, such as the US and China, as well as the growing threat of terrorism, global security is a major concern for the international community. One of the latest developments is the increasing tension in the South China Sea. This region is the center of territorial disputes between China and several Southeast Asian countries. China, through its militarization program, strengthens its position, while the US continues to support its allied countries by sending maritime fleets to maintain freedom of navigation. This issue not only affects regional stability, but also has far-reaching impacts on global supply chains and international trade. Additionally, cyber threats increasingly dominate global security discussions. Cyberattacks against critical infrastructure, such as power grids and health systems, have exposed many countries. Cases of ransomware attacks, such as that of Colonial Pipeline in the US, underscore the importance of cyber protection. Countries are now racing to improve their cyber defense capabilities and collaborate with the private sector to strengthen digital security. On the other hand, climate change is also a security issue that cannot be ignored. Floods, forest fires and extreme weather phenomena are the impacts of global warming which can trigger mass migration and resource conflicts. Countries, especially in vulnerable regions, are increasingly threatened by the risk of instability resulting from environmental change. Therefore, many countries are now integrating climate policies into their national security strategies. Regarding terrorism, extremist groups such as ISIS and al-Qaeda continue to look for ways to adapt to new conditions and continue to recruit members. Even though ISIS has lost much of its control, the threat of terrorism remains through lone wolf attacks and online propaganda. Intelligence cooperation between governments is increasingly important to prevent planned attacks. Technological developments also bring new challenges and opportunities for global security. Artificial intelligence (AI) and more sophisticated communications tools can be used for good purposes, such as predicting and preventing conflict, but can also be exploited for malicious activities. For example, drone technology, which was originally used for surveillance, is now used in armed conflict. In this context, multilateralism becomes increasingly important. International organizations such as the UN and NATO play a role in approaching complex and often interrelated security issues. International cooperation in the fields of cyber, dealing with terrorism and climate change must be increased to respond to existing challenges and prevent conflict escalation in the future. As a guarantee for global stability, the involvement of civil society in discussions regarding security is very important. Education and awareness among citizens can increase societal resistance to extremist propaganda and encourage participation in public policy. By focusing on inclusivity, sustainable development, and effective diplomacy, the possibility of creating more stable and sustainable security will increase.