Maritime security is a strategic issue in Southeast Asia due to the high dependence of ASEAN countries on sea lanes for trade and regional stability. This study aims to analyze Indonesia's role in strengthening maritime security cooperation in ASEAN. The methods used are literature studies and analysis of policy documents related to ASEAN maritime cooperation and national maritime policies. The results of the study show that Indonesia is active in various regional forums such as the ASEAN Maritime Forum (AMF) and the Expanded ASEAN Maritime Forum (EAMF), and carries the Global Maritime Fulcrum (GMF) initiative. Despite challenges such as overlapping institutional authority and limited resources, Indonesia continues to demonstrate a strong commitment to promoting maritime diplomacy, strengthening governance, and handling issues such as IUU Fishing and the South China Sea conflict. The implications of this cooperation are increased regional stability and strengthening ASEAN's position in facing the geopolitical dynamics of the Indo-Pacific.

This paper examines the military cooperation between Brunei Darussalam and the United Kingdom, as well as its impact on regional stability in Southeast Asia, focusing on Brunei's non-alignment strategy as a small state. Using a descriptive analytic method based on a literature review, this paper explores descriptive data on the dynamics of Brunei's foreign policy strategy in building bilateral relations, the role of the UK post-Brexit through the Global Britain strategy in strengthening bilateral relations with ASEAN member countries, and the implementation of Brunei and British military cooperation in maintaining regional security stability through the presence of British Forces Brunei since 1963. This is supported by historical ties and the Garrison Agreement to strengthen the security of the country and the region without confrontation. Therefore, this paper shows that Brunei has managed to balance military cooperation with the UK and economic cooperation with China in the midst of great power rivalries and tensions over the South China Sea dispute, as well as its implications for regional stability.

This paper discusses the impact of the Sudanese refugee crisis on security stability in the Chad border region. The conflict between the Sudanese Armed Forces and Rapid Support Forces since April 2023 has triggered a massive wave of refugees, making Chad one of the main recipient countries. Using a regional security complex theory approach, this paper shows that the flow of refugees not only creates social and economic pressures, but also magnifies security risks such as infiltration of armed groups, tensions between communities, and weak control in the border region. Through document analysis, the paper highlights how Chad's capacity constraints exacerbate the situation, as well as the need for a long-term response involving cross-actor coordination and sustained international support.

Natuna waters are the most vulnerable area to illegal fishing because there is abundant potential for fishery resources. It was recorded that from May to December 2016, there were 280 foreign vessels in Natuna waters, which resulted in economic losses of 2.98 trillion Rupiah. This study aims to examine and assess the policies and actions that the Indonesian government has implemented in overcoming illegal fishing activities in the area. The results of this study are that the Natuna Waters Area is part of the Indonesian Archipelago Sea Lane (ALKI) and functions as a global waterway. The Natuna Waters Area borders with neighboring countries and is connected to open waters, making it vulnerable to illegal fishing activities. The Indonesian government's strategy in dealing with cases of unlawful fishing in Natuna waters effectively increases the protection of state sovereignty and marine resources through policies such as sinking ships and maritime diplomacy. However, this implementation policy overcomes obstacles in the form of intimidation from other countries, such as China, and weaknesses in supervision and coordination between domestic institutions, which can affect microorganisms in fisheries management and maritime security in the area.