Cambodia Security Report — September 03, 2026

Security analysis based on open-source intelligence and web research. Period: August 27 — September 03, 2026.

Executive Summary

During the period of August 27 to September 3, 2026, Cambodia's security landscape was primarily shaped by persistent border tensions with Thailand and significant advancements in its diplomatic and defense relations with both the United States and China. Phnom Penh continued to strongly protest alleged Thai military incursions and occupation of Cambodian territory, advocating for peaceful resolution through international law. Concurrently, Cambodia hosted a high-level US congressional delegation, signaling a renewed commitment to defense cooperation, including the resumption of joint military exercises in 2027. Domestically, authorities reported substantial progress in a nationwide crackdown on technology-enabled scam operations, freezing over $300 million in illicit assets and arresting thousands of suspects. These developments highlight Cambodia's complex balancing act in regional geopolitics and its efforts to address internal security threats.

Key Security Developments

• Persistent Cambodia-Thailand Border Dispute: Cambodia has vehemently protested Thailand's alleged continued occupation of its territory. On August 27, Prime Minister Hun Manet accused Thai forces of creating "facts on the ground" by occupying Cambodian territory, installing barbed wire, shipping containers, and infrastructure, and preventing over 20,000 displaced Cambodians from returning home. The Ministry of Interior released a statement on September 2, demanding Thailand withdraw troops and cease occupying civilian locations and destroying property. Cambodia's Ambassador to France, Luy David, vowed on September 2 to raise sovereignty concerns at the Francophonie summit despite pressure from Bangkok.
• US Congressional Delegation Visit and Enhanced Bilateral Ties: A high-level US congressional delegation, led by Representatives Jimmy Panetta, Jim Baird, Julie Johnson, and Kristen McDonald Rivet, visited Phnom Penh on August 27. Discussions with Prime Minister Hun Manet focused on expanding strategic bilateral cooperation in trade, investment, healthcare, and security, including continued US support for landmine removal. This visit underscores a positive trajectory in Cambodia-US relations.
• Resumption of Joint Military Exercises with the US: Cambodia and the United States are set to resume the "Angkor Sentinel" military exercise in 2027 after a nearly decade-long hiatus, with preparations already underway. This decision, announced on August 14 following a meeting between Hun Manet and US Under Secretary of War for Policy Elbridge Colby, aims to strengthen defense cooperation and foster closer friendship between the armed forces of both nations. The Cooperation Afloat Readiness and Training (CARAT) exercise is also planned to resume in 2027.
• Intensified Crackdown on Cyber Scams: Cambodian authorities have significantly ramped up efforts against technology-enabled fraud. As of September 3, 2026, over US$300 million in assets linked to these scams have been frozen across multiple bank accounts. The Secretariat of the Commission for Combating Technology-enabled Scams (CCTC) reported that from July 2025 to August 31, 2026, 446 cases were referred to courts, involving 3,927 suspects of 29 different nationalities. Over 700 scam compounds have been closed, and nearly 30,000 suspects arrested, including 15 high-ranking officials.
• Diplomatic Briefing on Online Scams: On August 29, the Ministry of Foreign Affairs and International Cooperation (MFAIC) held a diplomatic briefing on the progress of combating online scams in Cambodia, highlighting the government's commitment to addressing this issue.
• International Parliamentary Conference on Geopolitical Risks: Cambodia hosted the Second Inter-Parliamentary Speakers' Conference (ISC-2) in Phnom Penh from August 26-28. Senate President Hun Sen urged global lawmakers to strengthen parliamentary diplomacy and build mutual trust to prevent escalating geopolitical tensions. Prime Minister Hun Manet also briefed delegates on the Cambodia-Thailand border situation, reaffirming Cambodia's commitment to peaceful resolution under international law.
• UK Support for Mine Clearance: The United Kingdom is expanding its support for Cambodian communities affected by conflict, combining mine clearance efforts with education aid. This initiative was highlighted during Indo-Pacific Minister Rosie Winterton's visit to the country.
• Cambodia's Stance on Border Demarcation: Information Minister Neth Pheaktra reaffirmed on August 27 that the disputed An Seh area lies within Cambodian territory, stressing that unauthorized visits and military presence cannot create sovereignty. Cambodia maintains that borders are defined by treaties, conventions, and maps, not by flags or occupation, and called for the Joint Boundary Commission (JBC) to resume survey and demarcation work.
• Continued Strong China-Cambodia "Ironclad Friendship": While not a new development within this specific week, the context of Cambodia's strong ties with China remains relevant. China considers its relations with Cambodia a priority in its diplomacy, and both nations are committed to building a "Cambodia-China Community with a Shared Future in the New Era". This includes deepening cooperation in political, diplomatic, economic, trade, and infrastructure sectors.

Geopolitical Impact and Regional Dynamics

Cambodia's security developments during this period underscore its delicate balancing act in a complex regional environment, particularly concerning its relations with major powers and its immediate neighbor, Thailand. The persistent border dispute with Thailand remains a significant flashpoint, with Cambodia consistently asserting its sovereignty and calling for adherence to international law and existing agreements. This ongoing tension impacts regional stability, as evidenced by the displacement of over 20,000 Cambodians and the fragility of the December 2025 ceasefire. Cambodia's diplomatic efforts to raise the issue at international forums, such as the Francophonie summit, demonstrate its strategy to garner international support and pressure Thailand for a peaceful resolution.

The renewed commitment to defense cooperation with the United States, including the resumption of the "Angkor Sentinel" military exercises in 2027, marks a notable shift in Cambodia's foreign policy. This move, following the lifting of a US arms embargo in late 2025 and a US warship visit to Ream Naval Base in early 2026, suggests Cambodia's pragmatic approach to diversify its security partnerships and signal strategic autonomy, without necessarily abandoning its close ties with China. This development could be seen by some as an attempt to mitigate concerns about China's growing influence, particularly regarding the Ream Naval Base, which has been a point of contention for the US.

Despite warming ties with the US, Cambodia continues to maintain an "ironclad friendship" with China, which remains its largest investor, creditor, and trade partner. High-level exchanges and deepening cooperation across various sectors, including the "2+2" Strategic Dialogue mechanism, reinforce this strong relationship. This dual engagement strategy allows Cambodia to leverage benefits from both major powers, but also necessitates careful navigation to avoid being drawn into their geopolitical rivalry. The crackdown on cyber scams, a concern for both the US and China, also demonstrates Cambodia's efforts to address shared security interests and improve its international standing.

Military and Defense Analysis

Cambodia's military and defense posture during this period is characterized by its ongoing efforts to assert territorial integrity amidst border disputes and a strategic re-engagement with the United States in defense cooperation. The Royal Cambodian Armed Forces (RCAF) remain actively involved in monitoring and responding to the Cambodia-Thailand border situation, with reports indicating the continued presence of Thai troops in disputed areas and the deployment of infrastructure like barbed wire and shipping containers. This necessitates a sustained defensive posture along the border, particularly in provinces such as Oddar Meanchey and Preah Vihear. The Cambodian Ministry of Defence has been actively briefing military attachés on these developments, underscoring the seriousness with which Cambodia views these incursions.

A significant development is the planned resumption of joint military exercises with the United States, specifically the "Angkor Sentinel" and "CARAT" exercises, slated for 2027. This marks a reversal of a nearly decade-long suspension and indicates a renewed focus on enhancing the capabilities of the Cambodian armed forces through training and exchanges with the US. The US has also reaffirmed its commitment to supporting mine action and unexploded ordnance (UXO) clearance, which directly contributes to the safety and operational freedom of military personnel and civilians alike. This re-engagement with the US provides an alternative avenue for military modernization and capability development, complementing Cambodia's existing strong defense ties with China, which has supplied MLRS systems and assisted in naval base development. The visit of a US warship to Ream Naval Base in January 2026 further highlighted this evolving dynamic, demonstrating a willingness from both sides to engage on sensitive defense matters.

Outlook and Forecast

Short-term trends (1-3 months): In the immediate future, the Cambodia-Thailand border dispute is likely to remain a critical flashpoint. Cambodia will continue its diplomatic offensive, raising the issue at international forums and reiterating calls for Thailand to withdraw troops and adhere to existing agreements and international law. The Ministry of Interior's recent press statement demanding troop withdrawal and the Cambodian Ambassador to France's vow to raise the conflict at the Francophonie summit indicate a sustained, assertive diplomatic stance. There is unlikely to be a swift resolution to the border demarcation issues, and the situation for displaced Cambodians will remain a humanitarian concern.

Critical flashpoints and risk areas: The primary risk area is the Cambodia-Thailand border, particularly in provinces like Oddar Meanchey and Preah Vihear, where Cambodian officials allege ongoing Thai military occupation and infrastructure development. Any further perceived incursions or attempts to alter the status quo by either side could escalate tensions, potentially leading to localized clashes despite the existing ceasefire. The unresolved issue of displaced persons also poses a humanitarian and political risk. Another area to monitor is the cybersecurity landscape, as criminal groups adapt their tactics to smaller, decentralized operations, requiring continuous vigilance and adaptation from Cambodian authorities.

Indicators to monitor: Key indicators to monitor include any progress or lack thereof in the Joint Boundary Commission (JBC) meetings between Cambodia and Thailand, which are crucial for border demarcation. Statements and actions from both Cambodian and Thai foreign ministries regarding the border will be important. On the diplomatic front, the implementation of renewed US-Cambodia defense cooperation, particularly the preparations for the "Angkor Sentinel" and "CARAT" exercises in 2027, will indicate the depth and sincerity of this re-engagement. Continued reports on the cyber scam crackdown, including asset freezes and arrests, will show the effectiveness of Cambodia's efforts against organized crime.

Strategic recommendations: Cambodia should continue to pursue a multi-pronged diplomatic strategy to resolve the border dispute with Thailand, emphasizing international law and existing bilateral agreements while actively engaging international bodies. Simultaneously, it should proceed with the planned defense cooperation with the United States to diversify its security partnerships and enhance its military capabilities, ensuring these engagements are transparent and do not unduly antagonize its relationship with China. Domestically, sustaining the crackdown on cyber-scam operations is crucial not only for internal security but also for improving Cambodia's international reputation and fostering a more secure investment climate. Furthermore, continued investment in mine and UXO clearance remains vital for national development and human security.

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