Cambodia Security Report — September 10, 2026

Security analysis based on open-source intelligence and web research. Period: September 03 — September 10, 2026.

Security Analysis Report: Cambodia (September 03, 2026 - September 10, 2026)

Executive Summary

During the period of September 03 to September 10, 2026, Cambodia's security landscape was primarily shaped by ongoing border tensions with Thailand and significant diplomatic shifts. A key development was the announcement on September 4 that Cambodia's army will resume joint military exercises with the United States in early 2027, signaling a warming of relations after a decade-long suspension. Concurrently, Cambodia continued to protest alleged Thai military incursions and aggressive border activities, while also preparing for UN-backed conciliation talks on maritime disputes. Efforts to combat cybercrime remained a priority, with authorities reporting substantial asset freezes and upcoming international cooperation. These developments highlight Cambodia's complex balancing act between its traditional ally China and renewed engagement with the United States, alongside persistent regional border challenges.

Key Security Developments

• Resumption of Joint Military Exercises with the United States
  On September 4, 2026, the Royal Cambodian Army announced it would resume joint military exercises with the United States, specifically "Exercise Angkor Sentinel 2027," in February of next year. These exercises had been suspended for almost a decade since 2017. The move aims to strengthen "interoperability and disaster-response capabilities," reflecting a renewed momentum in Cambodia-U.S. military cooperation. This decision follows several meetings between top defense officials from both countries, despite Washington's lingering concerns about China's military presence at Cambodia's Ream Naval Base.

• Protest Against Thai Airspace Incursion
  Cambodia lodged a formal protest against Thailand following an alleged unauthorized entry of a Royal Thai Air Force helicopter into Cambodian airspace on September 3, 2026. The incident occurred near the Daung International Border Checkpoint in Battambang province, with the helicopter reportedly crossing approximately 400 meters into Cambodian territory. The Cambodian Ministry of Interior stated that this action violated Cambodia's sovereignty, international aviation rules, and existing bilateral commitments.

• Briefing to Foreign Military Attachés on Border Situation
  On September 3, 2026, Cambodia's Ministry of National Defence briefed 22 military attachés representing 18 countries in Phnom Penh on the ongoing border situation with Thailand. The briefing updated the attachés on the December 2025 ceasefire and efforts to resume technical border work, emphasizing Cambodia's commitment to a peaceful resolution under international law.

• Continued Displacement and Infrastructure Damage from Border Conflict
  As of September 6, 2026, 18,703 displaced civilians, including 9,437 women and 6,066 children, remained unable to return home due to ongoing security concerns along the Cambodia-Thailand border. The Ministry of Interior attributed this continued displacement to obstruction by the Thai military and extensive damage to civilian areas and property, including 26 schools, 14 hospitals, 74 government buildings, and four ancient temples.

• UN Human Rights Council Addresses Thai Border Aggression
  On September 9, 2026, Cambodia raised concerns at the UN Human Rights Council regarding the continuing human rights and humanitarian consequences of the Cambodia-Thailand border conflict. Ambassador Ke Sovann, Permanent Representative of Cambodia to the UN Office at Geneva, cited "unlawful activities of Thai armed forces in occupied areas well within Cambodian territory," including the installation of barbed wire, construction of military infrastructure, and issuance of land titles to Thai citizens before joint border demarcation.

• Upcoming UNCLOS Conciliation Talks with Thailand
  The first convention of the United Nations Convention on the Law of the Sea (UNCLOS) initiated by Cambodia is scheduled to take place from September 14 to 16 in Singapore. These talks aim to resolve maritime border and oil repository issues in the Gulf of Thailand following Thailand's unilateral revocation of the 2001 maritime Memorandum of Understanding (MoU) in May. Cambodia expressed confidence in the conciliation process to achieve a fair and lasting resolution.

• Deepening Economic and Strategic Ties with China
  Cambodia and China held the 2nd Cambodia-China Public-Private Sector Dialogue on September 3, 2026, in Phnom Penh, aimed at strengthening economic, trade, and investment cooperation. Senior officials from both nations reaffirmed their "ironclad friendship" and commitment to building a "Cambodia–China All-Weather Community with a Shared Future." Additionally, both countries pledged to deepen cooperation in the information and media sectors, focusing on information exchange and capacity building.

• Significant Progress in Anti-Cybercrime Campaign
  Cambodian authorities reported freezing over $300 million USD in bank accounts linked to cybercrime between July 2025 and August 2026. The national campaign against online scams has led to the detention of nearly 30,000 suspects of 39 nationalities, with over 22,000 foreign nationals rescued and repatriated. Cambodia is set to host the International Conference on Combating Online Scams (ICCOS-2026) on September 23-24 to further international cooperation.

• Maritime Drug Trafficking Cooperation with South Korea
  On September 7, 2026, Cambodia's National Authority for Combating Drugs (NACD) and the Korea Coast Guard (KCG) signed a Memorandum of Understanding (MoU). This agreement aims to strengthen cooperation in combating transnational maritime drug trafficking and organized crime networks operating at sea, in response to the growing use of maritime routes for illicit drug transport.

• Cambodia Rejects Thai Cybercrime Allegations as Pretext for Force
  On September 7, 2026, Cambodia dismissed suggestions that allegations of online scam operations could justify foreign military action, calling such claims unfounded and a violation of sovereignty. Deputy Prime Minister Sun Chanthol stated that Cambodia would not accept cybercrime allegations as a pretext for interference or the use of force, following statements by Thai officials linking border clashes to the destruction of alleged scam centers.

Geopolitical Impact and Regional Dynamics

Cambodia's security developments this week underscore its delicate and evolving geopolitical position, particularly within the context of great power competition and persistent regional disputes. The announced resumption of joint military exercises with the United States, "Angkor Sentinel 2027," marks a significant step towards re-engagement with Washington after a decade of strained relations. This move could be interpreted as Cambodia seeking to diversify its strategic partnerships and reduce over-reliance on China, especially given long-standing U.S. concerns about Beijing's military presence at Ream Naval Base. Such a re-balancing act could be welcomed by some ASEAN members and the U.S. as a positive development for regional stability, potentially offering a counterweight to China's growing influence.

However, Cambodia simultaneously reinforced its "ironclad friendship" and "All-Weather Community with a Shared Future" with China through economic dialogues and pledges of cooperation in media and information. This dual-track approach highlights Cambodia's pragmatic foreign policy, aiming to leverage economic benefits from China while cautiously re-establishing security ties with the U.S. The ongoing border conflict with Thailand, characterized by protests over airspace incursions and continued civilian displacement, remains a significant regional flashpoint. Cambodia's appeals to ASEAN and the UN Human Rights Council, alongside the upcoming UNCLOS conciliation talks, demonstrate its reliance on multilateral mechanisms to manage this bilateral dispute, which has broader implications for ASEAN's unity and dispute resolution capabilities.

The persistent border tensions with Thailand, coupled with Cambodia's diplomatic maneuvers, affect the broader strategic landscape of Southeast Asia. While the U.S. seeks to strengthen its Indo-Pacific strategy, Cambodia's engagement with both Washington and Beijing reflects the region's complex geopolitical realities where countries often avoid exclusive alignments. The upcoming visit of the Myanmar President, though outside the reporting period, also signals Cambodia's continued diplomatic engagement within ASEAN, even with controversial member states, further shaping regional dynamics. The emphasis on peaceful resolution of maritime disputes through UNCLOS also reinforces the importance of international law in managing territorial claims in a region rife with such issues.

Military and Defense Analysis

Cambodia's military and defense posture during this period reflects a strategic pivot towards enhancing capabilities through renewed international cooperation, while simultaneously managing an active border conflict. The most notable development is the planned resumption of "Exercise Angkor Sentinel 2027" with the United States in February next year. This marks the end of a nearly decade-long suspension of joint drills and is aimed at strengthening "interoperability and disaster-response capabilities." This move suggests a potential shift in Cambodia's military modernization programs, possibly incorporating more Western training and equipment, which could diversify its defense acquisitions that have historically leaned heavily on China. The discussions between Cambodian and U.S. defense officials prior to this announcement indicate a deliberate effort to patch up rocky relations and foster closer defense ties.

Despite this re-engagement with the U.S., Cambodia's force posture remains heavily influenced by its ongoing border dispute with Thailand. The Ministry of National Defence's briefing to foreign military attachés on September 3 underscores the continued need for vigilance and readiness along the shared border, particularly in provinces like Battambang, Oddar Meanchey, Banteay Meanchey, and Preah Vihear. The reported damage to public infrastructure and the displacement of thousands of civilians highlight the humanitarian and logistical strain on Cambodia's defense resources in these areas. While specific defense spending trends were not detailed, the need for reconstruction and continued border security likely places demands on the national budget. The protest over the alleged Thai helicopter incursion on September 3 further emphasizes the active nature of this border, requiring constant monitoring and a defensive posture.

The signing of an MoU with South Korea on September 7 to combat maritime drug trafficking also points to Cambodia's efforts to enhance its maritime security capabilities, particularly in law enforcement and intelligence sharing at sea. This indicates a recognition of evolving transnational threats beyond traditional land borders. While China's role in upgrading the Ream Naval Base remains a point of concern for the U.S., Cambodia continues to assert that the base is not for exclusive use by any foreign power, welcoming friendly foreign vessels for joint exercises and humanitarian operations. This stance reflects Cambodia's attempt to maintain strategic autonomy and balance its defense relations amidst competing regional interests.

Outlook and Forecast

Short-term trends (1-3 months): In the immediate future, Cambodia will likely focus on navigating the upcoming UNCLOS conciliation talks with Thailand (September 14-16, 2026) in Singapore. The outcome of these discussions on maritime boundaries and oil resources in the Gulf of Thailand will be a critical indicator of bilateral relations and regional stability. Concurrently, Cambodia will continue its diplomatic efforts to pressure Thailand to fully adhere to the December 2025 ceasefire agreement and resume joint border demarcation. The International Conference on Combating Online Scams (ICCOS-2026) on September 23-24 will highlight Cambodia's commitment to cybersecurity and international cooperation in this domain. The planned visit of the Myanmar President (September 11-12) will also be closely watched for its implications on ASEAN's internal dynamics and Cambodia's role in regional diplomacy.

Critical flashpoints and risk areas: The Cambodia-Thailand land border, particularly in provinces like Battambang, Oddar Meanchey, Preah Vihear, and Banteay Meanchey, remains a critical flashpoint. Continued alleged incursions, military activities, and the unresolved issue of civilian displacement pose a high risk of escalation. The Gulf of Thailand, specifically the overlapping maritime claims, presents another risk area, with the UNCLOS talks being a crucial test for peaceful dispute resolution. While the resumption of U.S. military exercises is a positive step, the underlying U.S. concerns about China's presence at Ream Naval Base could resurface as a point of contention, especially if transparency issues are not fully addressed.

Indicators to monitor: Key indicators to monitor include the progress and outcomes of the UNCLOS conciliation talks, particularly any agreements on joint development of oil and gas resources. The frequency and nature of incidents along the Cambodia-Thailand land border, including reports of military movements or civilian displacement, will be crucial. Statements and actions from both Cambodian and Thai officials regarding border demarcation and ceasefire adherence should be closely observed. Furthermore, the implementation details and scope of the "Angkor Sentinel 2027" exercises with the U.S. will indicate the depth of renewed defense cooperation. Finally, the effectiveness of Cambodia's anti-cybercrime initiatives and the level of international collaboration achieved at ICCOS-2026 will be important for assessing its digital security posture.

Strategic recommendations: Cambodia should prioritize sustained diplomatic engagement with Thailand to ensure full adherence to the December 2025 ceasefire and to accelerate joint border demarcation efforts, possibly seeking enhanced ASEAN or UN monitoring. It is recommended that Cambodia maintain transparency regarding activities at Ream Naval Base to alleviate international concerns and foster trust, particularly with the United States. The government should continue to strengthen its cybersecurity framework and international partnerships to combat online scams, as these threats have significant economic and social implications. Furthermore, Cambodia should leverage its renewed engagement with the U.S. to diversify its defense capabilities and training, while carefully balancing its strategic relationship with China to avoid becoming entangled in great power rivalry. Continued commitment to international law and multilateral mechanisms for dispute resolution, as demonstrated by the UNCLOS initiative, is vital for long-term regional stability.

Sources

• mynorthwest.com
• washingtonpost.com
• thestar.com.my
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• houstonchronicle.com
• ground.news
• khmertimeskh.com
• facebook.com
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• akp.gov.kh
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