Cambodia Security Report — June 29, 2026

Security analysis based on open-source intelligence and web research. Period: June 22 — June 29, 2026.

Executive Summary

Cambodia's security landscape from June 22 to June 29, 2026, was marked by escalating diplomatic tensions with Thailand over a disputed maritime boundary and intensified efforts to combat pervasive cyber scam operations. Cambodia formally initiated compulsory conciliation under the UN Convention on the Law of the Sea (UNCLOS) for the maritime dispute, prompting Thailand to suspend all other bilateral talks and maintain border closures. Concurrently, Cambodia deepened its strategic security partnership with China, with President Xi Jinping proposing enhanced cooperation, particularly against telecom fraud. A significant development in Cambodia-US relations was the preparation for the revival of the "Angkor Sentinel" joint military exercise, signaling a warming of ties after an eight-year hiatus. Domestically, authorities continued crackdowns on cyber scam compounds, though reports indicate persistent abuses and a growing humanitarian concern for stranded victims.

Key Security Developments

• Maritime Boundary Dispute with Thailand Escalates to UNCLOS Arbitration
  On June 22, 2026, Cambodia formally initiated a compulsory conciliation process under the United Nations Convention on the Law of the Sea (UNCLOS) to resolve a long-standing maritime boundary dispute with Thailand. This dispute concerns a 26,000 square kilometer area in the Gulf of Thailand, believed to hold significant natural gas and oil reserves. Thailand, while agreeing to participate in the UN arbitration, expressed dismay at Cambodia's move and consequently suspended all other bilateral talks and maintained border closures. The Cambodian People's Party (CPP) reaffirmed its commitment to defending sovereignty and peaceful settlement of border issues with Thailand based on international law.

• Thailand Suspends Bilateral Talks and Maintains Border Closures
  Following Cambodia's decision to pursue UNCLOS arbitration for the maritime dispute, Thailand announced on June 22, 2026, that it would halt all other border talks and keep border gates between the two countries closed. Thai Foreign Minister Sihasak Phuangketkeow stated that while Thailand would send representatives to the UN-backed negotiations, they disagreed with Cambodia's approach to the conciliation process. This move reflects heightened tensions after previous border clashes and Thailand's unilateral termination of a 2001 framework pact for talks on the disputed maritime belt.

• China Proposes Enhanced Security Partnership with Cambodia
  On June 26, 2026, Chinese President Xi Jinping proposed establishing a "security partnership" with Cambodia during a meeting with Cambodian Senate head Samdech Techo Hun Sen in Beijing. The proposal aims to deepen cooperation in various security fields, with a particular focus on making "sustained efforts to root out the chronic problem of telecom fraud". This visit by Hun Sen to China from June 25-27, 2026, further solidified the comprehensive strategic partnership between the two nations.

• Resumption of US-Cambodia Joint Military Exercise "Angkor Sentinel" Planned
  Senior military leaders from the United States and Cambodia met in Phnom Penh on June 27, 2026, to prepare for the revival of the "Angkor Sentinel" joint military exercise, scheduled for 2027. This marks the resumption of military cooperation after an eight-year hiatus, with the last exercise held in 2016. The U.S. embassy in Phnom Penh stated that the exercise aims to strengthen bilateral military ties, enhance peacekeeping capabilities, disaster response, and regional preparedness, reflecting a shared commitment to peace and stability in the Indo-Pacific.

• Cambodia Intensifies Crackdown on Cyber Scam Operations
  Cambodian authorities, including the Ministry of Justice and the Anti-Scam Committee, announced on June 17, 2026, a tightening of the anti-cyber fraud law and intensified crackdown operations from June 2026. Phnom Penh police renewed warnings against online scams and pledged tougher enforcement on June 22, 2026, directing officers to intensify investigations. This follows earlier raids in Phnom Penh, Sihanoukville, and Poipet in early June, leading to arrests of foreign nationals.

• Persistent Abuses and Stranded Victims in Cyber Scam Compounds
  Despite government crackdowns, Amnesty International reported on June 8, 2026, that widespread abuses persist in Cambodia's cyber-scam compounds, with many operations continuing and trafficking victims not receiving adequate protection. The report, based on evidence from 73 survivors, documented human trafficking, forced labor, torture, and sexual violence. Furthermore, thousands of freed scam workers are reportedly stranded in Cambodia with little money and no way home, facing significant fines for overstaying visas.

• Vietnam and Cambodia Strengthen Military Training and Border Security
  High-level defense talks were held in Hanoi on June 24, 2026, between Vietnam People's Army Deputy Chief of the General Staff Lieutenant General Le Van Huong and Royal Cambodian Armed Forces Deputy Commander-in-Chief General Sao Sokha. Both nations pledged to deepen military training reforms and tighten joint border security, advancing key initiatives under the 2026 bilateral defense cooperation plan, including high-level exchanges and joint border management.

• Cambodia Urges ASEAN Unity Against Transnational Cybercrime
  On June 24, 2026, Cambodian Deputy Prime Minister Abhisantibindit Sar Sokha called on ASEAN nations to unite against online scams, terrorism, and immigration offenses, warning that cyber fraud has become a "critical regional risk". Speaking at the 29th ASEAN Directors-General of Immigration Departments and Heads of Consular Affairs Divisions meeting in Siem Reap, he urged stronger intelligence-sharing and joint border-control efforts, expanding cooperation with dialogue partners like Japan, China, and South Korea.

• Implementation of Mandatory Military Service in 2026
  While announced in July 2025, Cambodia is proceeding with the enforcement of mandatory military service starting in 2026. The law requires all Cambodian men aged 18 to 30 to serve, with the obligatory training period extended from 18 to 24 months, citing rising border tensions with Thailand as a contributing factor. The Cambodian People's Party (CPP) explicitly backed the implementation of the conscription law during its June 28, 2026, statement.

• Cambodia Protests Thai Military Activities Along Land Border
  Cambodia's Joint Boundary Commission reported on June 23, 2026, that it has sent 42 diplomatic protest notes to Thailand since a ceasefire agreement took effect in July 2025, accusing Thai forces of activities inside Cambodian territory. This includes 32 notes filed after a second ceasefire agreement in December 2025. Thailand, meanwhile, is constructing a new security fence along the border in Chanthaburi, which is 45% complete, and has invited Cambodian representatives to monitor its construction.

Geopolitical Impact and Regional Dynamics

Cambodia's recent security developments underscore its complex geopolitical balancing act amidst intensifying regional competition. The decision to pursue UNCLOS arbitration against Thailand for the maritime dispute, while a legal recourse, has significantly strained bilateral relations, leading to Thailand's suspension of all other border talks and continued closures. This escalation could potentially destabilize the immediate border region, especially given past clashes, and highlights the persistent challenges in resolving long-standing territorial claims in Southeast Asia. The involvement of a UN mechanism also draws international attention to a dispute with significant economic implications due to potential hydrocarbon reserves.

Simultaneously, Cambodia is deepening its strategic ties with China, as evidenced by President Xi Jinping's proposal for a security partnership and ongoing high-level exchanges. This robust engagement, including the "2+2" (soon to be "3+3") strategic dialogue mechanism, reinforces Beijing's influence in Phnom Penh and the broader Indo-Pacific. China's commitment to assist in combating telecom fraud aligns with Cambodia's domestic security priorities but also strengthens intelligence and law enforcement cooperation between the two countries. This growing alignment with China, particularly in security, may be viewed with apprehension by some regional actors and Western powers, potentially contributing to a more polarized regional security environment.

Conversely, the planned resumption of the "Angkor Sentinel" joint military exercise with the United States in 2027 signals a warming of US-Cambodia military cooperation after an eight-year hiatus. This development suggests Cambodia's efforts to diversify its security partnerships and maintain a degree of strategic autonomy, preventing an over-reliance on any single major power. The US engagement, focused on peacekeeping and disaster response, could offer a counter-balance to China's expanding military presence and influence in the region. However, navigating these relationships with both the US and China requires delicate diplomacy to avoid being drawn into great power competition. The ongoing cyber scam crisis, which Cambodia is actively addressing with ASEAN and international partners, also highlights a transnational threat that requires broad regional and global cooperation, transcending traditional geopolitical alignments.

Military and Defense Analysis

Cambodia's military and defense posture during this period reflects a dual focus on internal security threats and external territorial defense, alongside a strategic engagement with major powers. The planned implementation of mandatory military service starting in 2026, extending the service period to 24 months, is a significant development aimed at increasing the number of soldiers and reinforcing the Royal Cambodian Armed Forces (RCAF). This move is explicitly linked to rising border tensions with Thailand, indicating a perceived need to bolster national defense capabilities in response to ongoing disputes.

Defense spending trends were not explicitly detailed in the available news, but Prime Minister Hun Manet previously pledged to "look at increasing" the defense budget in conjunction with the conscription law. This suggests a commitment to modernization and capability development, although specific acquisitions or arms deals within the reporting period were not highlighted beyond general Chinese military support mentioned in the context of Thailand's lack of concern. The deepening security partnership with China, including discussions on defense coordination and security cooperation, implies potential for further Chinese military assistance or arms transfers in the future.

The resumption of the "Angkor Sentinel" joint military exercise with the United States in 2027 is a notable shift in Cambodia's force posture and international military engagement. This exercise, focusing on peacekeeping, disaster response, and regional preparedness, will enhance the RCAF's capabilities in these areas and improve interoperability with US forces. Furthermore, high-level defense talks with Vietnam on June 24, 2026, resulted in pledges to deepen military training reforms and tighten joint border security, indicating ongoing efforts to strengthen capabilities and coordination with immediate neighbors. These engagements reflect Cambodia's strategy to enhance its defense capabilities through diverse partnerships while addressing both conventional and non-conventional security challenges.

Outlook and Forecast

Short-term trends (1-3 months):
In the immediate future, the Cambodia-Thailand maritime dispute will remain a critical flashpoint. The UNCLOS compulsory conciliation process will commence, but progress is likely to be slow and contentious, with Thailand maintaining its suspension of bilateral talks and border closures. This diplomatic standoff could lead to continued low-level tensions along the land border, with Cambodia likely to continue issuing diplomatic protests against perceived Thai military activities. The cyber scam crackdown will intensify, with authorities conducting more raids and arrests. However, the humanitarian crisis of stranded victims and the persistence of scam operations, as highlighted by Amnesty International, will likely continue to draw international scrutiny and pressure. Cambodia's diplomatic engagement with both China and the US will continue, with further details emerging on the proposed China-Cambodia security partnership and the planning for the "Angkor Sentinel" exercise.

Critical flashpoints and risk areas:
The disputed maritime area in the Gulf of Thailand remains a primary flashpoint, given the significant natural resources at stake and the current diplomatic impasse. Any perceived unilateral actions or resource exploration attempts by either Cambodia or Thailand in this area could quickly escalate tensions. The land border between Cambodia and Thailand, particularly in areas with unresolved demarcation, also poses a risk of localized skirmishes or incidents, especially with Thailand's ongoing border fence construction. The cyber scam compounds, despite crackdowns, represent a persistent internal security risk, potentially leading to further human rights abuses, transnational crime, and diplomatic complications if foreign nationals remain trapped or exploited.

Indicators to monitor:
Key indicators to monitor include the progress and outcomes of the UNCLOS conciliation process for the maritime dispute, including any statements or actions from the Permanent Court of Arbitration. Observers should also watch for any changes in Thailand's stance on bilateral talks and border closures. Regarding China-Cambodia relations, monitoring the specifics of the proposed security partnership and any new defense agreements or military aid will be crucial. For US-Cambodia ties, details on the "Angkor Sentinel" exercise, including its scope and participants, will indicate the depth of renewed cooperation. Domestically, the effectiveness of the cyber scam crackdowns and the government's approach to repatriating and assisting stranded victims will be important humanitarian and security indicators. Finally, any public statements or actions related to the mandatory military service implementation will shed light on Cambodia's internal defense priorities.

Strategic recommendations:
Cambodia should prioritize de-escalation and diplomatic engagement with Thailand, even while pursuing UNCLOS arbitration, to prevent border tensions from spiraling into conflict. Actively seeking mediation or confidence-building measures could be beneficial. On the cybercrime front, Cambodia must enhance its efforts to dismantle scam networks comprehensively, focusing not just on raids but also on addressing the underlying systemic issues and ensuring robust victim identification, protection, and repatriation mechanisms. International cooperation, particularly with ASEAN partners and countries whose citizens are victims, is paramount. Strategically, Cambodia should continue its balanced engagement with both China and the United States, leveraging both relationships for economic development and security assistance without becoming overly dependent on either. This involves transparent communication with all partners regarding its security and defense policies. Internally, the government should ensure that the implementation of mandatory military service is conducted fairly and transparently, with adequate training and welfare provisions for conscripts.

Sources

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