Thai authorities have placed growing emphasis on combating cross-border crime, particularly online scams, as part of their public security messaging. This narrative has increasingly appeared alongside discussions of border security and regional stability. Against this backdrop, the Royal Thai Armed Forces Headquarters and the Military Command Centre have introduced measures affecting supply routes linked to Cambodia, including restrictions on fuel and military-related shipments in the Gulf of Thailand.
Thai authorities describe these steps as precautionary measures aimed at preventing resources from being used to support military activities connected to the ongoing territorial dispute along the Thai–Cambodian border. On 14 December, the Thai military submitted a proposal to the National Security Council (NSC) calling for tighter maritime controls in the Gulf of Thailand. The proposal recommended stricter inspections of vessels carrying fuel and military-related supplies bound for Cambodia. The NSC approved the proposal on 16 December, authorizing expanded inspections under coordinated protocols and more comprehensive checks on ships operating in the area.
Before the formal NSC approval, enforcement actions had already begun. On 15 December, fuel shipments to Laos were delayed due to concerns that the fuel could be diverted to Cambodia. Lao officials clarified that the shipments were intended for domestic use only. Despite this, the delays continued. Thai authorities later issued an apology, explaining that the actions were taken on security grounds.
The Thai Navy has designated certain areas in the Gulf of Thailand as high-risk zones. This has complicated naval coordination and affected commercial shipping. Shipping companies and insurers have begun reassessing routes and risk exposure. As a result, transport costs have increased, and delays have become more frequent.
The Gulf of Thailand is a key maritime corridor for regional and international trade. Measures applied in this area therefore affect not only Cambodian shipping but also vessels from countries not involved in the dispute. For Cambodia, the economic impact has been immediate. Coastal regions have faced higher pressure, with fishermen advised to suspend operations. This has disrupted local incomes and added strain to the tourism sector.
From an international law perspective, maritime security measures are permitted when justified by clear security needs. At the same time, the United Nations Convention on the Law of the Sea (UNCLOS) emphasizes freedom of navigation and proportionality in enforcement actions. Prolonged or expansive controls in shared maritime spaces raise questions about balance between security concerns and the rights of other states.
Within ASEAN, long-standing norms stress restraint, non-use of force, and the avoidance of actions that may widen disputes or harm regional stability. Spillover effects on third countries, such as Laos, increase the risk of diplomatic friction and weaken confidence in regional economic integration.
While Thailand presents the measures as security-driven, their broader purpose remains open to interpretation when assessed against their scope and effects. The restrictions go beyond immediate border management and have applied pressure across maritime, economic, and logistical domains. This has increased economic strain on Cambodia and introduced uncertainty into regional trade routes. At the same time, the measures do not clearly distinguish between military, economic, or law-enforcement objectives.
One interpretation views the actions as part of a broader military posture linked to the territorial dispute. Another may see them as an effort to weaken Cambodia’s economic and logistical capacity. A third frames the measures within Thailand’s stated focus on countering cross-border criminal networks, including online scams. However, the current measures do not clearly align with a single, defined objective, as their impact extends well beyond targeted law-enforcement.
Author: Kheav Chantharina