Indonesia Security Report — September 30, 2026

Security analysis based on open-source intelligence and web research. Period: September 23 — September 30, 2026.

Executive Summary

Indonesia demonstrated a robust and active security posture from September 23 to September 30, 2026, marked by significant international military exercises, proactive diplomatic engagements, and intensified efforts in cybersecurity. The nation hosted "Trident Resolve 2026," the largest ASEAN Defence Ministers' Meeting-Plus (ADMM-Plus) disaster response exercise in a decade, involving 19 countries and focusing on humanitarian assistance, disaster relief, and cybersecurity. Concurrently, Indonesia advanced its diplomatic agenda at the UN General Assembly, advocating for global resilience, UN reform, and a two-state solution for Palestine, while also signing the UN Convention against Cybercrime. Domestically, cybersecurity remained a critical concern, with reported losses of US$6.2 billion from cyber attacks this year and ongoing legislative efforts to enhance cyber resilience. The period also saw a key defense acquisition with the delivery of US-made Amphibious Combat Vehicles, bolstering Indonesia's marine capabilities.

Key Security Developments

• Major Multinational Disaster Response Exercise Concludes
  Exercise Trident Resolve 2026, the largest ASEAN Defence Ministers' Meeting-Plus (ADMM-Plus) disaster response exercise in a decade, concluded on September 26 in Banten, Western Java. The exercise involved approximately 2,200 military personnel and civilian officials from 19 countries, including all 11 ASEAN nations and eight dialogue partners (Australia, China, India, Japan, New Zealand, Russia, South Korea, and the United States). It integrated cybersecurity, humanitarian assistance and disaster relief (HADR), and military medicine, simulating scenarios such as earthquakes, volcanic eruptions (specifically Anak Krakatau), and tsunamis, highlighting Indonesia's leadership in regional security cooperation and disaster preparedness.

• Indonesia Strengthens Diplomatic Ties at UN General Assembly
  Indonesian Foreign Minister Sugiono engaged in extensive bilateral and multilateral diplomacy at the 81st UN General Assembly in New York from September 22-26. He held meetings with foreign ministers from the UK, Netherlands, Germany, and representatives from various friendly nations and partners, discussing efforts to strengthen bilateral relations and address regional and global issues. Indonesia also actively sought international support for its bid for a non-permanent seat on the UN Security Council for the 2029–2030 term.

• Advocacy for Palestinian Statehood at the UN
  During the UN General Assembly, Foreign Minister Sugiono reiterated Indonesia's call for the accelerated implementation of a two-state solution for Palestine on September 25. He firmly rejected actions threatening Palestinian statehood, specifically condemning the E1 settlement plan and emphasizing the importance of maintaining the legal and historical status quo of holy sites in Jerusalem. Indonesia affirmed its commitment to providing humanitarian assistance and strengthening Palestinian capacity.

• Indonesia Signs UN Convention Against Cybercrime
  On September 24, Indonesia officially signed the United Nations Convention against Cybercrime at the UN Headquarters in New York. This landmark agreement, which Indonesia played a pivotal role in drafting, is crucial for strengthening national efforts to prevent and criminalize cyber offenses and provides a legal framework for international cooperation against transnational cybercrimes, including online fraud, online gambling, and child sexual abuse.

• Significant Losses from Cyber Attacks Reported
  Bank Indonesia Governor Destry Damayanti announced on September 24 that cyber attacks have caused an estimated US$6.2 billion in damages in Indonesia this year alone. This highlights the escalating cybersecurity risks, exacerbated by the increasing use of automation and artificial intelligence, and underscores the urgent need for robust cyber resilience across critical sectors.

• First Batch of US-made Amphibious Combat Vehicles Delivered
  Indonesia officially received the first batch of US-made Amphibious Combat Vehicles (AAV M-35) for its Marine Corps on September 28. This acquisition, announced by Defense Minister Sjafrie Sjamsoeddin, is part of a phased defense capability development aimed at enhancing the mobility, maneuverability, and operational readiness of the Marine Corps in amphibious operations and safeguarding Indonesia's strategic archipelagic areas.

• Ongoing Efforts to Combat Online Scams
  Indonesia participated in the International Conference on Combating Online Scams (ICCOS) in Phnom Penh, Cambodia, from September 23–24, reinforcing its commitment to bilateral law enforcement cooperation against cybercrime syndicates. The Indonesian Embassy in Phnom Penh continues to address the issue of approximately 700 Indonesian nationals detained in Cambodia for involvement in online scam activities, urging their repatriation.

• Cybersecurity Legislative Push and Industry Engagement
  Indonesia's House of Representatives is deliberating a comprehensive cybersecurity and cyber resilience bill that proposes establishing a new National Cybersecurity Agency with broad supervisory powers over critical infrastructure, digital products, and AI systems. Concurrently, the "CySec Indonesia 2026" forum and the "Cyber Resilience & Defense Conference & Expo 2026" (CRD-CX 2026) were held, bringing together government leaders and experts to foster collaboration and innovation in securing Indonesia's digital future.

• Super Garuda Shield 2026 Activities Highlighted
  While Super Garuda Shield 2026 formally concluded on September 11, news reports during this period continued to detail its significance. The exercise, involving 4,743 personnel from 21 countries, included joint jungle combat training, tactical tunnel shooting, night flight training with Boeing AH-64 Apache helicopters, and combined joint land strikes with rocket artillery and aviation in locations like Baturaja and Martapura, South Sumatra. This exercise underscored the elevated Major Defense Cooperation Partnership between Indonesia and the United States.

• Persistent Internal Security Concerns in Papua
  The threat of terrorism in Indonesia remains ongoing, with the potential for small-scale violent attacks in various locations, including tourist areas and government buildings. Furthermore, regular instances of violence continue to be reported in the provinces of Papua Pegunungan (Highland Papua) and Papua Tengah (Central Papua), posing persistent internal security challenges.

Geopolitical Impact and Regional Dynamics

Indonesia's security developments during this period underscore its commitment to active and independent foreign policy, aiming to be a bridge-builder and a significant regional player. The successful hosting of Exercise Trident Resolve 2026, the largest ADMM-Plus exercise in a decade, demonstrates Indonesia's central role in fostering multilateral defense cooperation and disaster response capabilities within ASEAN and with key partners like the US, China, and Russia. This exercise, encompassing cybersecurity and humanitarian assistance, reinforces a cooperative security framework in the Indo-Pacific, potentially mitigating tensions by promoting practical collaboration over confrontational stances.

Indonesia's robust diplomatic engagement at the UN General Assembly, particularly its advocacy for UN reform, a stronger voice for the Global South, and a two-state solution for Palestine, positions it as a moral voice on the international stage. These efforts, coupled with its bid for a non-permanent seat on the UN Security Council, reflect Indonesia's ambition to shape global governance and address pressing international issues. The signing of the UN Convention against Cybercrime further solidifies its commitment to international law and cooperation in combating transnational threats, which has positive implications for global digital security.

The ongoing discussions and Indonesia's expressed hope for the finalization of the South China Sea Code of Conduct (CoC) this year highlight its persistent efforts to manage regional maritime disputes peacefully. While not a direct claimant in all disputed areas, Indonesia's stance on adhering to UNCLOS and promoting a rules-based order is crucial for regional stability, especially given the complex dynamics involving major powers like China and the US. The continued Major Defense Cooperation Partnership with the US, exemplified by the Super Garuda Shield exercise and defense acquisitions, balances Indonesia's non-aligned principles with practical security needs, enhancing its defense capabilities while navigating the strategic competition between the US and China in the Indo-Pacific.

Military and Defense Analysis

Indonesia's military and defense posture during this period reflects a clear trajectory towards modernization and enhanced interoperability with international partners. The acquisition of the first batch of US-made Amphibious Combat Vehicles (AAV M-35) for the Marine Corps on September 28 signifies a tangible step in boosting the Indonesian Navy's capabilities for amphibious operations and safeguarding its vast archipelagic territory. This acquisition aligns with the broader Major Defense Cooperation Partnership established with the United States in April 2026, which emphasizes military modernization, troop training programs, and the development of advanced defense measures and next-generation technologies.

The conclusion of Exercise Trident Resolve 2026 in Banten, involving 19 nations, and the continued reporting on Super Garuda Shield 2026 activities in South Sumatra, demonstrate Indonesia's commitment to large-scale, multinational exercises. These exercises are vital for improving the interoperability of the Indonesian National Armed Forces (TNI) with partner nations, enhancing combat readiness, and refining responses to complex security challenges, including humanitarian assistance and disaster relief. The focus on jungle combat, night flight training, and combined joint land strikes during Super Garuda Shield indicates a comprehensive approach to developing diverse operational capabilities across various terrains and conditions. Defense spending trends, while not explicitly detailed for this specific week, are implicitly geared towards these modernization programs and the acquisition of advanced platforms, as evidenced by the AAV M-35 delivery and previous reports of Rafale fighter jet acquisitions.

Outlook and Forecast

Short-term trends (1-3 months): In the immediate future, Indonesia is likely to continue its active diplomatic engagements, particularly in the lead-up to the co-hosting of the UN Peacekeeping Ministerial (UNPM) in Jakarta in 2027, and further efforts to garner support for its UN Security Council bid. The focus on cybersecurity will intensify, with the proposed cybersecurity and cyber resilience bill expected to progress through the House of Representatives, potentially leading to the establishment of a new national cybersecurity authority. Given the reported US$6.2 billion losses from cyber attacks this year, there will be increased pressure to implement robust protective measures and frameworks. Defense acquisitions, particularly those under the Major Defense Cooperation Partnership with the US, are expected to continue, further modernizing Indonesia's military capabilities.

Critical flashpoints and risk areas: The South China Sea remains a critical flashpoint, with Indonesia's diplomatic efforts to finalize a Code of Conduct (CoC) being a key indicator. Any delays or increased assertiveness from other claimants could heighten regional tensions. Domestically, the provinces of Papua Pegunungan and Papua Tengah will likely continue to experience instances of violence, requiring sustained attention from internal security forces. The pervasive threat of cyber attacks, particularly against government-linked systems, critical infrastructure, and healthcare data, poses a significant and evolving risk, with the potential for substantial economic and societal disruption. The ongoing issue of online scam syndicates involving Indonesian nationals in neighboring countries like Cambodia also presents a persistent challenge for law enforcement and diplomatic efforts.

Indicators to monitor: Key indicators to monitor include the progress and eventual ratification of the cybersecurity and cyber resilience bill, which will shape Indonesia's future cyber defense landscape. Developments in the South China Sea CoC negotiations, including any breakthroughs or setbacks, will be crucial for regional stability. The frequency and severity of cyber incidents, particularly against critical infrastructure, will serve as a barometer for the effectiveness of Indonesia's cybersecurity measures. Additionally, the situation in Papua, including any changes in the level of violence or government response, should be closely observed.

Strategic recommendations: Indonesia should prioritize the swift and effective implementation of its new cybersecurity legislation, ensuring adequate resources and capabilities for the proposed National Cybersecurity Agency. Continued investment in advanced cyber defense technologies and talent development is essential to counter the growing sophistication of cyber threats. Diplomatically, Indonesia should maintain its proactive stance in multilateral forums, leveraging its role as a bridge-builder to de-escalate regional tensions, particularly in the South China Sea, and to advocate for international norms in cyberspace. Domestically, a comprehensive and nuanced approach to addressing the root causes of violence in Papua, alongside robust security operations, is necessary. Furthermore, strengthening international law enforcement cooperation is vital to combat transnational organized crime, including online scam syndicates, which have significant economic and social impacts.

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