By: Dionísio Babo Soares (personal opinion)
Malaysia’s successful mediation of the 2025 ceasefire between Cambodia and Thailand is a powerful demonstration of ASEAN centrality, the principle that the Association of Southeast Asian Nations (ASEAN) should remain the cornerstone of regional diplomacy and conflict resolution. This achievement highlights ASEAN’s potential to manage its own disputes, reinforcing its autonomy in a geopolitically complex region. However, the peace agreement’s fragility, the conflict’s historical depth, and the involvement of external powers underscore the urgent need to strengthen ASEAN’s mechanisms to ensure this centrality is maintained and enhanced.
The Cambodia-Thailand border dispute is a century-old issue, rooted in colonial-era ambiguities and exacerbated by modern nationalist fervor. The 1904 Franco-Siamese Treaty, negotiated between French colonial authorities (representing Cambodia) and Siam (modern Thailand), left territorial demarcations vague, particularly around the Preah Vihear temple. In 1962, the International Court of Justice awarded the temple to Cambodia, but disputes over the surrounding area persisted, fueling tensions. These tensions erupted violently in 2008 following Cambodia’s UNESCO listing of Preah Vihear, leading to military clashes that sporadically continued into 2011. Landmine incidents marked the escalation in 2025, troop engagements near Preah Vihear, Ta Moan Thom, and various maritime disputes, resulting in significant casualties and displacing over 300,000 people. This deep-seated rivalry has made managing the conflict a formidable challenge, necessitating a credible regional mediator.
In July 2025, Malaysia, as ASEAN chair, brokered a critical ceasefire between Cambodia and Thailand, hosting talks in Putrajaya under Prime Minister Anwar Ibrahim. The agreement was signed by Cambodian Prime Minister Hun Manet and Thai Acting Prime Minister Phumtham Wechayachai, establishing an “immediate and unconditional” ceasefire that halted the deadliest clashes between the two nations in over a decade. Described as a “vital first step towards de-escalation and the restoration of peace and security,” this mediation showcased ASEAN’s ability to resolve internal conflicts without ceding control to external powers. This success is a clear affirmation of ASEAN centrality. By taking the lead, Malaysia upheld the organization’s principle of non-interference: respecting member states’ sovereignty while demonstrating that proactive engagement can occur within this framework. Historically, ASEAN’s consensus-based approach has slowed its response to crises, but Malaysia’s initiative signals a shift toward greater flexibility and responsibility. This pivotal moment proves that ASEAN can serve as the primary architect of regional stability, which is essential for maintaining its relevance amid growing external influence from powers like the United States and China.
While Malaysia’s mediation was the linchpin of the peace process, the role of external actors cannot be overlooked. U.S. President Donald Trump threatened to suspend trade negotiations and impose tariffs, leveraging economic pressure to push both nations toward compromise. China, with its deep ties to both Cambodia and Thailand, also participated in the talks, reflecting its strategic interests in Southeast Asia. These interventions expedited the ceasefire but raised questions about ASEAN’s autonomy. This duality underscores a critical challenge for ASEAN centrality; while external support can accelerate resolutions, overreliance undermines ASEAN’s credibility as a self-sufficient body. The Cambodia-Thailand case illustrates this tension: while U.S. and Chinese involvement was instrumental, it exposed ASEAN’s vulnerability to great power competition. To strengthen its centrality, ASEAN must ensure that its institutions primarily drive future mediations, relegating external powers to supportive roles. Striking this balance is vital for preserving regional autonomy and reinforcing ASEAN’s position as the central player in Southeast Asian affairs.
Although the ceasefire is a significant diplomatic triumph, it remains fragile. Deep-rooted mistrust, fueled by historical grievances and nationalist sentiments, threatens its longevity. Moreover, unresolved territorial disputes in terrestrial and maritime waters continue to simmer, with no precise resolution mechanism. The absence of robust enforcement measures further heightens the risk of violations, casting doubt on the truce’s sustainability.
For ASEAN to solidify its centrality, it must confront these challenges head-on. Strengthening monitoring and enforcement mechanisms, such as deploying neutral observers or leveraging the ASEAN Regional Forum (ARF), is essential to ensure compliance and rebuild trust. Ongoing dialogue, facilitated through established frameworks, can help prevent escalation. Malaysia’s mediation may be a starting point, but its success hinges on ASEAN’s capacity to sustain peace, proving that centrality is symbolic and actionable.
The economic dimensions of the conflict amplify the importance of ASEAN centrality. Cambodia and Thailand rely heavily on exports, particularly to the U.S., making the threat of tariffs a significant concern in times of instability. While the ceasefire averted immediate trade disruptions, the displacement of over 300,000 individuals and interruptions to border commerce highlight the broader economic toll. ASEAN’s crucial role in maintaining peace directly impacts the region’s economic stability, a vital factor for all ten member states. By preventing conflicts, ASEAN can foster a stable environment conducive to investment and intra-regional trade, minimizing vulnerability to external economic pressures. This interplay between security and prosperity underscores the necessity of strengthening ASEAN’s conflict resolution capacity. A robust organization, capable of swift and effective mediation, ensures that economic interdependence becomes a strength, rather than a liability.
Malaysia’s brokered peace presents a blueprint for enhancing ASEAN centrality and exposing areas for improvement. To build upon this success, ASEAN must enhance its conflict resolution mechanisms, reduce dependence on external powers by prioritizing ASEAN-led initiatives, and ensure regional autonomy. Moreover, as Timor-Leste’s potential membership looms, ASEAN must strategically manage this expansion to reinforce unity rather than strain it. Continuous dialogue and confidence-building measures are essential to mitigate historical rivalries and foster trust and cooperation among member states. Moreover, Timor-Leste can also bring fresh impetus into the organization and share its security experience in conflict resolution with other members of the organization.
In conclusion, Malaysia’s brokering of peace between Cambodia and Thailand is a resounding endorsement of ASEAN centrality, showcasing the organization’s capacity to lead in resolving its conflicts. This significant milestone, achieved amidst historical tensions and external pressures, highlights ASEAN’s potential as a regional stabilizer. Nevertheless, the ongoing challenges of sustaining peace and maintaining autonomy underscore the urgent need to fortify ASEAN’s mechanisms. By enhancing its diplomatic tools, decreasing reliance on external powers, and promoting cohesion, ASEAN can ensure that its centrality is not merely a principle but a cornerstone of a peaceful and prosperous Southeast Asia. Malaysia’s success serves as a call to action, one that ASEAN must heed to secure its future. (*)
