The recurring clashes between Thailand and Cambodia are often described as the residue of colonial-era boundary disputes. This explanation, however, obscures the real dynamic: the Thai military’s repeated exploitation of anachronistic disputes to preserve its political dominance. The armed forces have transformed relatively minor incidents into national crises, obstructing peace initiatives and weakening civilian leadership. The border conflict functions less as a cause of insecurity than as a political instrument, ensuring the military’s primacy in Thailand’s domestic order.

Historical grievances have been weaponized by the Thai military and nationalist elites. The 1962 and 2013 International Court of Justice rulings on Preah Vihear, widely perceived in Thailand as humiliating defeats, are continually invoked to mobilize patriotic sentiment. This “lost territory” discourse, echoed by scholars, media, and nationalist movements, allows the military to present itself as the sole defender of national sovereignty. Unlike disputes with Laos, Myanmar, or Malaysia—largely resolved through negotiation—the conflicts with Cambodia persist because they serve as an expedient political resource.

The pattern of military exploitation is clear. Cambodian cultural or local activities, such as ceremonies at Ta Moan Thom temple or the development of disputed borderland, are reframed as violations of Thai sovereignty. These narratives are reinforced through selective information operations, including the circulation of images of trench digging or allegations of landmine use. Escalation follows: border closures that paralyze trade, restrictions on civilian crossings, and localized skirmishes, such as the May 28, 2025 clash at Chong Bok in which a Cambodian soldier was killed. Ultimately, the military proclaims success, as in July 2025 when it claimed to have secured nearly three square kilometres of territory. In each step, the military stages itself as the indispensable guardian of the nation, strengthening its claim to political relevance.

The weakness of civilian governments has made such exploitation possible. Paetongtarn Shinawatra’s Pheu Thai administration, like those of her predecessors, relied on compromises with the monarchy–military establishment to remain in power. The leaked phone call with Hun Sen revealed her limited authority. Cambodia’s leader urged reopening the border, while Thailand’s Prime Minister confessed that her own military had become her opponent. Anutin Charnvirakul, succeeding her in September 2025, made the imbalance explicit by granting the military full autonomy over border management. This abdication of civilian control entrenched the armed forces’ supremacy in both security and politics, ensuring that they—not elected leaders—dictate the trajectory of Thai–Cambodian relations.

The obstruction of peace mechanisms follows naturally from this dominance. Thailand resists the deployment of an ASEAN Observer Team, fearing that independent verification would undermine its carefully constructed accusations. Bilateral forums such as the General Border Committee and Regional Border Committee remain dominated by defence officials, reproducing militarized perspectives rather than promoting solutions. Cambodia’s effort to internationalize the dispute through the United Nations and ICJ further fuels Thai defensiveness, creating a vicious circle in which diplomacy is marginalized while military confrontation is normalized.

This pattern reflects a deeper feedback loop. Anachronistic disputes trigger clashes, clashes justify military dominance, weakened civilian governments concede further ground, and that weakness allows disputes to be reignited at will. Nationalist media and intellectuals sustain this loop by perpetuating narratives of threatened sovereignty. The outcome is a cycle of militarized nationalism in which peace is structurally obstructed, not merely delayed.

In conclusion, the Thai–Cambodian border conflict is not simply a cartographic dispute but a political strategy. By manufacturing threats, the Thai military perpetuates its role as guardian of sovereignty, obstructs civilian authority, and sidelines diplomatic initiatives. Each flare-up becomes an opportunity to consolidate institutional power at the expense of elected governments. The tragedy is that ordinary people—border communities uprooted by artillery or trade restrictions—bear the costs of this militarized theatre. Lasting peace will not come from another ceasefire or ICJ ruling, but from a recalibration of power within Thailand itself. Unless civilian leaders reclaim authority over security policy and resist the exploitation of nationalist trauma, the border with Cambodia will remain a political stage where the military asserts primacy at the expense of both democracy and regional stability.