Cambodia Security Report — September 19, 2026

Security analysis based on open-source intelligence and web research. Period: September 12 — September 19, 2026.

Executive Summary

Cambodia's security landscape from September 12 to September 19, 2026, was primarily shaped by ongoing border tensions with Thailand, significant efforts to combat cybercrime, and a complex diplomatic balancing act between major powers. A notable development was Cambodia's agreement to remove recently dug trenches and barbed wire near the disputed Hill 450 following Thai concerns, indicating a de-escalation through dialogue. Concurrently, both nations initiated UN-backed conciliation talks in Singapore to resolve a long-standing maritime boundary dispute in the Gulf of Thailand. Domestically, Cambodia intensified its crackdown on online scam networks and hosted an ICT camp focusing on cybersecurity, while the US issued a travel advisory highlighting security risks, particularly along the Thai border.

Key Security Developments

• Border Security Incident at Hill 450: On September 17, 2026, Cambodian troops agreed to fill in a trench and remove barbed-wire barriers at Hill 450 near Chong Sa-ngam in Si Sa Ket province, following concerns raised by Thailand. Thai Army spokesman Maj. Gen. Winthai Suvaree stated that coordination teams from both sides discussed the issue, leading to Cambodia's agreement to restore the area, demonstrating resolution through talks. This incident had caused heightened tensions, with Thai forces closely monitoring the area after Cambodian troops dug trenches and installed concertina wire.

• Maritime Boundary Dispute Conciliation: Cambodia and Thailand commenced their first UN-backed conciliation meeting in Singapore from September 14 to 16, 2026, to address a long-running maritime dispute in the Gulf of Thailand. Cambodian Foreign Minister Prak Sokhonn stated that Cambodia seeks a treaty for a single all-purpose maritime boundary or, alternatively, an agreement for joint development and equitable sharing of resources in the disputed 26,000 sq km area, which is estimated to hold nearly 12 trillion cubic feet of natural gas and large quantities of oil.

• Allegations of Cluster Munition Use: At an international review conference on the Convention on Cluster Munitions held in Vientiane, Laos, from September 14 to 18, 2026, Cambodia accused Thailand of brutally using cluster munitions against Cambodian troops and civilians in past border conflicts. H.E. Heng Ratana, Director of the Cambodian Mine Action Centre, stated that cluster munition remnants have caused deaths and injuries in Banteay Meanchey, Oddar Meanchey, and Preah Vihear provinces, with over 296,096 hectares of land still contaminated.

• Intensified Crackdown on Online Scams: Cambodia is actively seeking stronger international cooperation to dismantle increasingly fragmented online scam networks. Minister of Information Neth Pheaktra announced on September 18, 2026, that authorities had investigated 832 suspected locations and conducted operations at 663 locations between July 2025 and August 31, 2026, cracking down on 86 major scam compounds. Cambodia is set to host the International Conference on Combating Online Scams (ICCOS-2026) in Phnom Penh from September 23-24, bringing together representatives from over 20 countries and three international organizations.

• Cybersecurity and Digital Rights Focus: The fourth Cambodia ICT Camp was held in Siem Reap from September 18 to 20, 2026, bringing together approximately 150 digital stakeholders. The camp focused on themes including AI and future digital rights, staying safe online (cybersecurity and rights of marginalized groups), and digital media, censorship, and access, addressing challenges like technology-facilitated gender-based violence, disinformation, and child online safety.

• US Travel Advisory Issued: On September 15, 2026, the U.S. State Department issued a Level 2 travel advisory for Cambodia, urging increased caution due to crime, civil unrest, and unexploded ordnance. Specifically, areas within 50 kilometers of the Cambodia-Thailand border were designated Level 4, "Do Not Travel," due to ongoing military tensions and the risk of armed conflict, which has reportedly led to civilian casualties.

• Strengthening China-Cambodia Economic Ties: The second Cambodia-China Government-Private Sector Dialogue was convened on September 3, 2026 (reported September 15), focusing on expanding existing investments and attracting new foreign direct capital into Cambodia. Co-chaired by Deputy Prime Minister H.E. Sun Chanthol and Chinese Ambassador H.E. Wang Wenbin, the forum aimed to reinforce trade ties and bolster commercial confidence under the bilateral Diamond Cooperation framework.

• Resumption of Cambodia-US Military Drills (2027): While outside the immediate reporting period, it's significant that Cambodia announced on August 14, 2026, its intention to restart joint military exercises with the United States, "Angkor Sentinel," in 2027. This move, following a meeting between Prime Minister Hun Manet and US Under Secretary of Defense for Policy Elbridge Colby, aims to mend ties strained by Phnom Penh's closeness to China, after a decade-long pause in such drills.

• Military Modernization with Chinese Assistance (Contextual): In April 2026, Cambodia received its first Chinese-built Type 056-class corvette, "Koh Kong Senchey," at Ream Naval Base, with a second expected in 2027. This acquisition, part of efforts to modernize maritime defense capabilities, has drawn attention and concern from Thailand regarding heightened tensions in the northern Gulf of Thailand.

Geopolitical Impact and Regional Dynamics

Cambodia's security developments during this period underscore its delicate position within Southeast Asia, balancing complex bilateral relations and regional dynamics. The ongoing border and maritime disputes with Thailand remain a significant source of regional instability. The initiation of UN-backed conciliation talks on the maritime boundary in the Gulf of Thailand, while a diplomatic step, highlights the persistent territorial disagreements and the potential for conflict over valuable energy resources. Cambodia's accusations of Thailand's past use of cluster munitions further complicate these relations, adding a humanitarian dimension to the dispute and drawing international attention at the Vientiane conference.

The relationship with major powers, particularly China and the United States, continues to be a defining feature of Cambodia's strategic landscape. Cambodia's deep economic and defense ties with China are evident in the recent public-private dialogue aimed at expanding investment and the acquisition of Chinese military hardware, such as corvettes. This "ironclad friendship" with China provides significant economic benefits and military modernization support. However, Cambodia is also actively seeking to improve relations with the United States, as demonstrated by the planned resumption of joint military exercises in 2027. This dual engagement reflects Cambodia's strategy to diversify its partnerships and avoid over-reliance on a single power, even as the US continues to express concerns over Chinese military presence at Ream Naval Base.

The US travel advisory, particularly the "Do Not Travel" warning for border areas with Thailand, reflects international perceptions of the inherent risks in these disputed zones and could impact tourism and foreign investment. Cambodia's proactive stance against online scams, including hosting an international conference, positions it as a responsible actor in combating transnational crime, which has regional and global implications for cybersecurity and financial stability. Overall, Cambodia's recent actions indicate a pragmatic approach to foreign policy, seeking to manage immediate security challenges while strategically positioning itself amidst evolving geopolitical competition in the Indo-Pacific.

Military and Defense Analysis

Cambodia's military and defense posture during this period reflects a focus on border security, maritime defense, and a gradual modernization program, primarily supported by China, while also re-engaging with the United States for training. The Royal Cambodian Armed Forces (RCAF) are actively engaged in managing border tensions, as seen in the recent incident at Hill 450 with Thailand, where defensive positions were established. The ongoing issue of unexploded ordnance (UXO) from past conflicts, exacerbated by recent border clashes, continues to be a significant challenge, requiring substantial resources for clearance and posing a threat to both military personnel and civilians.

In terms of modernization, Cambodia has been enhancing its naval capabilities. The arrival of the first Chinese-built Type 056-class corvette, "Koh Kong Senchey," in April 2026, and the expectation of a second in 2027, marks a significant upgrade to its maritime defense. These corvettes are equipped with modern weaponry, including anti-ship missiles and air-defense systems, bolstering Cambodia's ability to safeguard its territorial waters, particularly in the contested Gulf of Thailand. Cambodia also acquired three types of Multiple Launch Rocket Systems (MLRS) from China, further indicating a reliance on Chinese arms for its defense needs. Defense spending is on an upward trend, with a record draft national budget for 2026 exceeding $10 billion, showing a greater focus on the defense sector.

A notable shift in force posture is the planned resumption of the "Angkor Sentinel" joint military exercises with the United States in 2027, after a decade-long hiatus. This re-engagement with the US for military training aims to strengthen bilateral ties, enhance peacekeeping capabilities, and improve disaster response and regional preparedness. This suggests a strategic effort by Cambodia to diversify its defense partnerships and training opportunities, moving towards a "multi-aligned" model that emphasizes strategic signaling and a technologically integrated defense.

Outlook and Forecast

Short-term trends (1-3 months): In the immediate future, Cambodia will likely continue its diplomatic efforts to de-escalate border tensions with Thailand, particularly through the ongoing UNCLOS conciliation process on the maritime dispute. The upcoming International Conference on Combating Online Scams (ICCOS-2026) in Phnom Penh (September 23-24) will be a key event, demonstrating Cambodia's commitment to addressing cybercrime and fostering international cooperation. Domestically, the crackdown on online scam networks is expected to intensify, with authorities continuing investigations and operations against these evolving criminal enterprises. Preparations for the resumption of joint military exercises with the US in 2027 will also likely be underway, signaling a continued warming of defense ties with Washington.

Critical flashpoints and risk areas: The primary flashpoints remain the land and maritime borders with Thailand. Despite the recent agreement to remove trenches at Hill 450, the underlying territorial disputes and allegations of past cluster munition use create a persistent risk of renewed skirmishes or heightened rhetoric. The maritime boundary dispute in the Gulf of Thailand, with its significant energy reserves, poses a long-term risk if conciliation talks fail to yield a mutually acceptable solution. The US travel advisory for border areas underscores the potential for unrest and armed conflict. Furthermore, the continued presence and expansion of Chinese facilities at Ream Naval Base, coupled with Cambodia's military acquisitions from China, could remain a point of contention with the US and other regional actors, potentially impacting regional stability.

Indicators to monitor: Key indicators to monitor include the progress and outcomes of the UNCLOS conciliation talks between Cambodia and Thailand, any new incidents or diplomatic exchanges regarding the land border, and the effectiveness of Cambodia's anti-online scam operations. The nature and scope of the "Angkor Sentinel 2027" military exercises with the US will provide insight into the trajectory of Cambodia-US defense cooperation. Additionally, any further developments regarding Chinese military aid, infrastructure projects, or naval activities at Ream Naval Base will be crucial for assessing geopolitical shifts. The implementation of the new National Policy on Mine Action 2026-2035 will also be important to track given the extensive UXO contamination.

Strategic recommendations: Cambodia should prioritize sustained diplomatic engagement with Thailand to peacefully resolve all outstanding border and maritime disputes, leveraging international mechanisms like UNCLOS. Strengthening cybersecurity infrastructure and international cooperation against online scams is vital for national security and economic stability. Diversifying defense partnerships, as indicated by the resumption of US military drills, should be strategically pursued to enhance capabilities and maintain a balanced foreign policy. Continued efforts in mine and UXO clearance, possibly with increased international assistance, are essential for humanitarian reasons and to unlock economic potential in affected areas.

Sources

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