The 2025 Thai–Cambodian border conflict was not a relapse into colonial-era grievances but a contemporary crisis born of domestic political weaknesses and external militarization. While ambiguous French-era maps and unresolved boundary and Hindu temple claims provided the historical frame, they do not explain the intensity or timing of the clashes. The decisive drivers lay in Thailand’s unresolved civil–military imbalance, Cambodia’s patrimonial governance, and the inflow of foreign weapons that magnified localized disputes into broader regional instability. A leaked phone call between Hun Sen and Paetongtarn Shinawatra revealed the fragility of civilian authority in Bangkok, while Phnom Penh’s assertiveness—bolstered by new Chinese armaments—demonstrated how sovereignty politics had become a tool of regime consolidation rather than conflict resolution.

The human and economic toll was severe. Nearly one million civilians on both sides were displaced, dozens were killed, and livelihoods were disrupted as border closures and insecurity paralysed trade, labour mobility, and tourism. Thailand’s manufacturing and tourism sectors contracted amid labour shortages and rising anti-Cambodian sentiment, while Cambodia faced inflationary pressure, food insecurity, and the loss of remittances following the large-scale return of migrant workers. What began as a border skirmish evolved into a sustained economic shock, underscoring how deeply interdependent the two economies—and societies—have become, and how quickly that interdependence can turn into vulnerability when securitized.

At the political level, the crisis exposed structural weaknesses in both states. In Thailand, military institutions dominated crisis management, sidelining civilian ministries and exploiting nationalist mobilisation to preserve institutional prerogatives. In Cambodia, dynastic patrimonialism transformed border tension into a mechanism for elite consolidation and diversion from economic malaise. These mutually reinforcing political logics ensured that escalation remained domestically advantageous even as it eroded long-term national interests on both sides.

The conflict also highlighted the fragility of regional security architecture. ASEAN’s mediation, led by Malaysia, produced a 13-point ceasefire agreement and facilitated agreement on the Terms of Reference of an ASEAN Observer Team (AOT). While the AOT marked a step toward institutionalised monitoring, its mandate remained deliberately narrow—focused on observation and reporting without enforcement authority—reflecting consensus politics and sovereignty sensitivities. ASEAN succeeded in facilitating restraint and preserving dialogue, but its role remained confined to confidence management rather than conflict resolution. External powers filled parts of this gap: the United States applied pressure through trade leverage, China was accused—credibly or otherwise—of fuelling escalation through arms transfers, and the United Nations remained largely symbolic. The episode underscored that sustainable peace cannot rest on external coercion alone, but must be anchored in regional mechanisms grounded in transparency and civilian diplomacy.

Despite the damage, credible pathways toward stability remain.

• Bilaterally, the General Border Committee (GBC), Regional Border Committees (RBCs), and Joint Boundary Commission (JBC) remain viable instruments if depoliticised and insulated from military monopolisation.
• Regionally, sustaining the ASEAN Observer Team as a standing monitoring mechanism would strengthen transparency and reduce risks of miscalculation, even within its limited mandate.
• Internationally, the International Court of Justice and the Ottawa Convention offer legal and humanitarian avenues to reinforce credibility and restraint when used selectively and strategically.