When Indonesia’s foreign minister stood before ASEAN counterparts in Jakarta last week, the air in the room felt less like diplomatic routine and more like a quiet reckoning. For years, the South China Sea has been a stage where great powers flex, claimants posture, and the rules-based order frays at the edges. Now, with Beijing’s assertiveness showing few signs of abating and Manila’s bilateral talks yielding incremental gains at best, Jakarta is pushing not just for another round of talks, but for a substantive, legally binding Code of Conduct (CoC) by year’s end—a deadline that, if met, would mark the first tangible progress since negotiations began in earnest over a decade ago.
This isn’t merely about maritime boundaries or fishing rights. It’s about whether ASEAN can transcend its reputation for consensus-driven inertia and become a genuine architect of regional stability. Indonesia, as the bloc’s largest member and de facto moral compass, is betting that its quiet diplomacy—rooted in non-interference but unafraid of principled engagement—can finally break the logjam. The stakes extend far beyond the Spratlys or Scarborough Shoal; they touch on the credibility of multilateralism in an era when unilateralism is ascendant.
The push comes at a pivotal moment. China’s Coast Guard has increased patrols near the Natuna Islands—Indonesia’s exclusive economic zone (EEZ)—by over 40% since 2023, according to data from the Indonesia Maritime Security Agency. Even as Beijing insists its vessels are conducting “routine patrols,” Jakarta has documented repeated incursions, including a March 2026 incident where Chinese coast guard ships shadowed Indonesian fishing vessels for 72 hours within 200 nautical miles of Natuna’s baseline. These aren’t abstract violations; they disrupt livelihoods, strain naval resources, and erode trust in Beijing’s assurances that its actions remain peaceful.
Yet framing this as a simple China-Indonesia spat misses the deeper structural challenge. The South China Sea disputes involve six claimants—China, Vietnam, the Philippines, Malaysia, Brunei, and Taiwan—each with overlapping claims rooted in historical narratives, UNCLOS interpretations, and strategic imperatives. A meaningful CoC must do more than establish hotlines or notification protocols; it needs to constrain coercive behavior, clarify maritime boundaries where possible, and create mechanisms for dispute resolution that don’t rely on the goodwill of the most powerful actor.
Here lies the information gap in much of the current reporting: while headlines focus on Indonesia’s advocacy, few examine why past CoC negotiations have stalled or what would make this year different. The answer lies not just in Jakarta’s persistence, but in shifting dynamics within ASEAN itself. Vietnam, traditionally cautious in confronting China, has quietly strengthened its maritime capabilities, acquiring two Gowind-class corvettes from France in late 2025 and conducting joint patrols with the Philippines in the Spratlys—a first in over a decade. Malaysia, meanwhile, has revived its claims to Luconia Shoals after discovering natural gas reserves estimated at 1.2 trillion cubic feet, prompting renewed naval presence in the area.
These developments suggest a subtle but significant shift: claimant states are no longer waiting solely for Beijing’s acquiescence. They are building their own deterrence and exploring minilateral arrangements outside the formal ASEAN-China framework. As Dr. Lina Agustina, senior fellow at the Indonesian Institute of Sciences (LIPI), explained in a recent briefing:
“ASEAN’s strength has always been its unity, but unity doesn’t imply uniformity. If the CoC is to have teeth, it must accommodate differentiated responses—allowing states like Vietnam or the Philippines to pursue stronger safeguards while still operating under a shared framework.”
Equally critical is the role of external powers, not as direct participants but as enforcers of norms. The United States, while not a claimant, has increased freedom of navigation operations (FONOPs) in the South China Sea by 25% in the past year, often coordinating with Australian and Japanese forces. More tellingly, the Quad—comprising the U.S., Japan, India, and Australia—issued a joint statement in March reaffirming support for “a substantive and effective CoC consistent with international law, including UNCLOS.” While such declarations don’t carry legal weight, they signal that major maritime powers will not acquiesce to a fait accompli built on coercion.
Economically, the implications are profound. The South China Sea carries roughly one-third of global maritime trade, valued at over $3.4 trillion annually. Disruptions—whether from accidental collisions, intentional blockades, or escalating tensions—would ripple through supply chains already strained by Red Sea tensions and Panama Canal droughts. A 2024 study by the ASEAN Secretariat estimated that a prolonged maritime crisis in the region could reduce regional GDP by up to 1.5% annually, hitting export-dependent economies like Vietnam and Malaysia hardest.
Yet there is cautious optimism. Unlike past deadlines that came and went without consequence, this year’s push benefits from a rare alignment: Indonesia holds the ASEAN chairmanship in 2026, giving Jakarta unprecedented agenda-setting power. Behind-the-scenes channels suggest Beijing, while unwilling to relinquish its nine-dash line claim, may be open to a CoC that defers sovereignty questions in favor of practical maritime management—a approach reminiscent of the 2002 Declaration on the Conduct of Parties in the South China Sea (DOC), but with stronger verification mechanisms.
As of this writing, negotiators are drafting provisions on maritime environmental protection, search-and-rescue coordination, and joint scientific research—areas where consensus is easier to achieve. The real test will come in the final months, when discussions turn to enforcement. Will the CoC include independent monitoring? Will violations trigger tangible consequences? Or will it, as skeptics fear, become another exercise in procedural theater?
For now, Indonesia’s push represents more than a diplomatic initiative; it’s a test of whether regional institutions can adapt to a multipolar world without sacrificing their core principles. If successful, it could offer a template for managing other flashpoints—from the East China Sea to the Arctic. If not, the South China Sea may remain what it has long been: a simmering contest where the strongest current determines the flow.
As we watch these negotiations unfold, one question lingers: In an age of rising great-power rivalry, can the quiet persistence of middle powers still shape the rules of the game? The answer may determine not just the fate of a sea, but the future of regional order itself.
