Indonesia Security Report — September 27, 2026

Security analysis based on open-source intelligence and web research. Period: September 20 — September 27, 2026.

Executive Summary

Indonesia has demonstrated a robust and proactive approach to its security and diplomatic posture during the period of September 20-27, 2026. Key developments include a significant naval modernization milestone with the commissioning of its first aircraft carrier, KRI Sriwijaya, and enhanced military interoperability through joint exercises with France. Diplomatically, Jakarta actively engaged at the UN General Assembly, advocating for global resilience, Palestinian statehood, and launching its campaign for a non-permanent seat on the UN Security Council. Domestically, cybersecurity remains a critical concern, with substantial financial losses reported from cyberattacks this year, prompting calls for stronger legislative frameworks. These efforts underscore Indonesia's commitment to strategic autonomy and its growing role as a "bridge-builder" in a complex global landscape, balancing national interests with regional and international responsibilities.

Key Security Developments

• Naval Modernization and Aircraft Carrier Commissioning
  On September 24, 2026, Indonesia commissioned its first aircraft carrier, the KRI Sriwijaya, formerly the Italian light aircraft carrier Giuseppe Garibaldi. The 40-year-old vessel, acquired for free from Italy, is expected to serve primarily as a helicopter and drone platform for air transport, surveillance, disaster relief, and potentially anti-submarine warfare, though its precise role and operational costs remain subjects of debate. This acquisition marks a significant step in President Prabowo Subianto's ambitious military modernization drive.

• Joint Military Exercises with France (Mission Pegase 2026)
  The French Air Force conducted joint exercises with the Indonesian Air Force at Halim Perdanakusuma Air Force Base in Jakarta from September 20-25, 2026, as part of Mission Pegase 2026. This marked the first time Indonesian Rafale fighter jets, delivered earlier in the year, participated in joint drills with their French counterparts, enhancing interoperability and strategic partnership in the Indo-Pacific region.

• Future Joint Exercise with France (Garuda Guerrier)
  Indonesian Defense Minister Sjafrie Sjamsoeddin confirmed on September 23, 2026, that the Indonesian military will participate in the "Garuda Guerrier" joint exercise planned for November 2026 in France. This exercise is a follow-up to Mission Pegase 2026 and aims to further strengthen bilateral cooperation and bolster military capabilities through officer exchanges and advanced military training.

• UN Security Council Candidacy Campaign
  Indonesia officially launched its campaign for a non-permanent seat on the UN Security Council for the 2029-2030 term, with Foreign Minister Sugiono making a pitch at the UN Headquarters in New York on September 27, 2026. Jakarta aims to be a "bridge-builder," fostering unity, upholding international law, and representing the priorities of developing countries and the Global South.

• Advocacy for Palestinian Statehood at UNGA
  During the UN General Assembly high-level week, Foreign Minister Sugiono consistently called for the acceleration of the two-state solution for Palestine and reiterated Indonesia's full support for an independent and sovereign Palestinian state. He attended a ministerial meeting of the Group of Eight Arab and Islamic Countries focused on ensuring diplomatic peace efforts produce tangible results for Palestinians.

• Pledge of Peacekeepers to Gaza
  US President Donald Trump acknowledged Indonesia's commitment to deploy 20,000 personnel to Gaza as part of a UN-backed International Stabilization Force, as mentioned during his address to the UN General Assembly on September 22, 2026. Indonesia awaits details on the force's mandate before confirming deployment, emphasizing a focus on peacekeeping, reconstruction, and humanitarian aid.

• Signing of UN Convention against Cybercrime
  On September 24, 2026, Indonesia signed the United Nations Convention against Cybercrime at the UN Headquarters in New York. This move is crucial for strengthening national efforts to prevent and criminalize cyber offenses and enhance international cooperation against transnational crimes, including online fraud and scams, which have significantly impacted Indonesia.

• Significant Cybersecurity Losses and Legislative Push
  Cyberattacks have inflicted an estimated US$6.2 billion in damages in Indonesia this year alone, as reported by Bank Indonesia Governor Destry Damayanti on September 24, 2026. In response to these escalating threats, the Indonesian Internet Service Providers Association (APJII) is advocating for the immediate passing of the Cyber Security and Resilience Bill (KKS Bill) to provide legal certainty and integrated security standards for the industry.

• Enhanced Maritime Security Cooperation in Malacca Strait
  Indonesia and Malaysia are actively working to establish an integrated security framework for the Malacca Strait, one of the world's most critical maritime choke points. This initiative, reinforced by discussions in April 2026, prioritizes real-time intelligence sharing and coordinated regulation to address complex challenges like illicit trade and underwater surveillance.

• Strengthening Bilateral Ties with Sri Lanka and Singapore
  Indonesia held its first Bilateral Consultation with Sri Lanka in Colombo on September 22, 2026, signing a Memorandum of Understanding to strengthen dialogue and cooperation across political, security, trade, and maritime sectors. Separately, on September 20, 2026, President Prabowo and Singaporean Prime Minister Wong agreed on 26 cooperation documents, deepening strategic collaboration in areas such as women empowerment, research, environment, and financial technology.

• Warning on Sea-Level Rise and Maritime Borders
  Indonesian Foreign Minister Sugiono warned at a UN High-Level Meeting in New York on September 25, 2026, that the global climate crisis and rising sea levels must not be allowed to create international legal uncertainty regarding national maritime borders. He asserted that the UN Convention on the Law of the Sea (UNCLOS) must remain the definitive legal framework, particularly for archipelagic nations like Indonesia.

Geopolitical Impact and Regional Dynamics

Indonesia's security and diplomatic activities during this period reflect its evolving "Resilience Diplomacy" foreign policy, which centers on safeguarding national interests and expanding strategic room for maneuver in a fragmented global order. The commissioning of the KRI Sriwijaya and the ongoing naval modernization program signal Indonesia's intent to bolster its maritime presence and defense capabilities, particularly in the Indo-Pacific. While these acquisitions are framed for national defense and humanitarian roles, they contribute to a broader regional military build-up, potentially influencing the balance of power and perceptions among neighboring states and major powers.

The active engagement at the UN General Assembly, including the bid for a UN Security Council seat and strong advocacy for Palestine, positions Indonesia as a significant voice for the Global South. This diplomatic assertiveness, coupled with its non-aligned "free and active" foreign policy, allows Indonesia to maintain relations with diverse partners, including the US, China, and Russia, while pursuing its own strategic objectives. However, analysts note that this "partial multialignment" can sometimes appear contradictory, raising questions about the clarity and hierarchy of Jakarta's foreign policy interests.

The deepening defense cooperation with France, exemplified by joint exercises and future plans, diversifies Indonesia's strategic partnerships beyond its traditional ties with the US and Australia. This multi-vector approach aims to reduce dependence on a single foreign partner for defense acquisitions and technology transfer, granting Jakarta greater flexibility. Simultaneously, the ongoing Major Defense Cooperation Partnership with the United States, highlighted by the recently concluded Super Garuda Shield 2026, reinforces Indonesia's commitment to regional stability and interoperability with Western allies. The collaboration with Malaysia on Malacca Strait security further underscores Indonesia's role in addressing immediate regional maritime challenges.

Military and Defense Analysis

Indonesia's military is undergoing a significant modernization program, with a particular focus on enhancing its naval and air capabilities. The commissioning of the KRI Sriwijaya on September 24, 2026, marks a symbolic and practical leap, providing a large aviation platform for helicopter and drone operations, disaster relief, and potential anti-submarine warfare. This is complemented by earlier deliveries of advanced platforms such as Rafale fighter jets, Airbus A400M transport aircraft, and GM403 long-range air surveillance radars, which are intended to strengthen air-to-air and air-to-ground combat capabilities, logistics, and airspace protection.

Despite these ambitious acquisitions, military analysts caution that Indonesia's modernization efforts may still be perceived as an accumulation of platforms rather than a systemic leap in integrated military capability. The challenge lies in building and sustaining a coherent fighting force from a diverse collection of platforms and systems acquired from multiple foreign suppliers, which can create sustainment and integration challenges. The next priority for Indonesia's defense should be the development of a joint C4ISR (Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance) architecture, a sovereign tactical data link, comprehensive national radar coverage, and integrated command centers to ensure effective deterrence.

Defense spending for 2026 was estimated at Rp185 trillion (approximately US$12.5 billion), an increase from Rp166 trillion in 2025, reflecting the government's commitment to long-term modernization and operational readiness, particularly for its vast maritime and archipelagic waters. Beyond acquisitions, Indonesia is also pursuing defense technology transfers and codeveloping autonomous and subsurface maritime systems, alongside the construction of its first locally built Scorpène submarine, indicating a push towards greater defense self-reliance.

Outlook and Forecast

Short-term trends (1-3 months): In the immediate future, Indonesia will likely continue its active diplomatic engagements, particularly in the lead-up to the 2027 UN Peacekeeping Ministerial, which it will co-host with the Netherlands in Jakarta. The upcoming "Garuda Guerrier" joint exercise with France in November 2026 will be a key indicator of deepening defense ties and the integration of Indonesia's new Rafale capabilities. Domestically, the government will face increasing pressure to address cybersecurity vulnerabilities, potentially accelerating the legislative process for the Cyber Security and Resilience Bill, given the substantial financial losses reported. Efforts to restore services affected by past cyberattacks and prevent future incidents will remain a priority.

Critical flashpoints and risk areas: Cybersecurity remains a critical risk area, with the potential for further large-scale attacks on government infrastructure or critical sectors, leading to significant economic disruption and erosion of public trust. While the terrorism threat is deemed "under control," vigilance against evolving extremist methods and online radicalization remains crucial. In the maritime domain, while cooperation in the Malacca Strait is strengthening, the broader South China Sea region, though not explicitly highlighted with incidents this week, remains a persistent area of potential friction given Indonesia's extensive Exclusive Economic Zone (EEZ) and the presence of competing claims. The operationalization and integration of Indonesia's new naval assets, like the KRI Sriwijaya, will be closely watched by regional actors.

Indicators to monitor: Key indicators to monitor include progress on the Cyber Security and Resilience Bill, the effectiveness of new cybersecurity measures, and the outcomes of the "Garuda Guerrier" exercise. Further diplomatic statements or actions regarding the two-state solution and Indonesia's role in the Gaza stabilization force will be important. Any new defense acquisition announcements or shifts in defense spending will also provide insights into Indonesia's strategic priorities. The coherence and practical implementation of Indonesia's "Resilience Diplomacy" and "partial multialignment" foreign policy will be crucial to observe in its interactions with major global powers.

Strategic recommendations: Indonesia should prioritize the development of a fully integrated C4ISR architecture to maximize the effectiveness of its diverse new defense platforms, moving beyond mere accumulation of hardware. Investing heavily in cybersecurity infrastructure, human capital, and robust incident response capabilities is paramount to mitigate the severe and costly cyber threats. Diplomatically, Jakarta should continue to leverage its "bridge-builder" role to foster dialogue and de-escalation in regional and international flashpoints, while clearly articulating the hierarchy of its national interests within its multialignment strategy. Domestically, sustained efforts in counter-terrorism, including addressing online radicalization and strengthening community resilience, are essential to maintain the current positive trend in threat reduction.

Sources

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