The geopolitical dynamics of Southeast Asia are currently experiencing significant developments, influenced by various global and regional factors. New challenges and opportunities emerge as the power structure in the world changes, especially with the increasing influence of China and shifts in United States policy. One of the main aspects is the shift in global power and the emergence of China as a dominant economic and military power. China’s Belt and Road Initiative (BRI) is facilitating infrastructure development across Southeast Asia, offering large investments but also creating economic dependencies that could be detrimental to smaller countries in the region. Countries such as Indonesia, Malaysia and the Philippines face a dilemma between accepting investment from China or strengthening relations with the US and its allies. In addition, China’s rise has triggered responses from other countries, including Japan and India, which are now increasing their presence in the region through strategic initiatives and defense cooperation. Another factor that influences geopolitical dynamics is the South China Sea issue. Overlapping claims between China, Vietnam, the Philippines and other countries in the region create tensions that have the potential to trigger conflict. Maintaining freedom of navigation by the US in the form of destroyer operations and joint military exercises with Southeast Asian allies is an important step in responding to Chinese aggression. Other issues such as climate change, terrorism and pandemics also affect stability in the region. Countries in Southeast Asia must collaborate in dealing with cross-border challenges, strengthening cooperation in regional forums such as ASEAN. Climate change, which threatens food security and security, is one of the main focuses, urging countries to unite for sustainable development. Responses to these dynamics are also visible at the domestic level. Southeast Asian countries adapt their foreign policies to maintain sovereignty and stability. In this context, multilateral diplomacy becomes an important strategy to facilitate dialogue and peaceful resolution of conflicts. Political stability in each country also plays a role in determining the direction of foreign policy. Instability in Thailand, Myanmar, as well as changes in leadership in other countries affect international cooperation and the ability of these countries to participate actively in regional geopolitics. The influence of technology and information cannot be ignored either. The digital revolution provides new opportunities and challenges, influencing the way diplomacy is conducted. Digitalization opens the way for transparency, but also the potential for disinformation to disrupt political and social stability. With all these dynamics, Southeast Asia is at a decisive turning point. Strategic partnerships and regional collaboration are key to managing challenges, strengthening the bargaining position of small countries, and building a safer and more prosperous future. Changes in the global geopolitical landscape will continue to influence the strategies and policies taken by countries in the region towards a new era of complexity and uncertainty.