- Ongoing diplomatic negotiations regarding the South China Sea stability center on a binding Code of Conduct (COC) between China and ASEAN, fishing and resource sharing, and rules for coast guard behavior.
- Six claimants—China, the Philippines, Vietnam, Malaysia, Brunei, and Taiwan—still disagree on sovereignty; the 2016 arbitration ruling and the 2002 DOC remain the legal and political backdrops.
- Outside powers (the U.S., Japan, Australia, and the EU) back freedom of navigation and capacity-building; their involvement raises leverage but also complication.
- Two measurable pressure points: frequency of coast guard and militia encounters, and whether ASEAN presents a unified negotiating text. Both will determine whether diplomacy reduces the risk of armed clash.
What the negotiations really cover
At the core of the talks are three concrete agendas: a legally binding Code of Conduct to regulate state behavior; technical arrangements on fisheries and hydrocarbon exploration; and confidence-building measures for coast guard and naval encounters. Diplomats describe these as distinct but overlapping. If negotiators can pin down operational rules — who notifies whom, what vessel must do in a face-off, how to deconflict hydrocarbon licenses — they will have turned political rhetoric into routine practice.
The historical context matters. The 2002 Declaration on the Conduct of Parties in the South China Sea (DOC) established principles but avoided binding commitments on sovereignty. The 2016 Permanent Court of Arbitration ruling, which invalidated much of China’s nine-dash line claim, sharpened legal arguments but did not resolve on-the-water behavior. Those two documents form the legal background negotiators keep citing in closed-door meetings.
Who’s at the table — and who’s watching
Officially the talks sit between China and ASEAN as a bloc. In practice, they unfold in multiple formats: China-ASEAN working groups, bilateral exchanges (for example, Manila-Beijing talks), and parallel diplomacy involving the U.S., Japan, Australia, and the EU. These outside actors are not party to sovereignty claims, but they press for rules that protect maritime trade and navigation.
Named voices matter. Kao Kim Hourn, the ASEAN Secretary-General, has repeatedly called for a stable COC framework; Euan Graham of the International Institute for Strategic Studies (IISS) has warned that vague language risks institutionalizing ambiguity rather than resolving it. Jay Batongbacal of the University of the Philippines’ Institute for Maritime Affairs and Law of the Sea argues that any COC that sidesteps resource-sharing will be temporary at best. These are not abstract disagreements — they map to real red lines negotiators bring to the table.
Sticking points and leverage
Negotiators face five durable sticking points.
- Sovereignty vs. behavior: Claimants insist on keeping sovereignty language; China resists anything that looks like a concession to the arbitration ruling. Many ASEAN members prefer a COC that regulates conduct without prejudging sovereignty.
- Enforcement and verification: Who investigates an incident? Who imposes penalties? Unequal enforcement capacity makes many states wary of binding rules without independent verification.
- Fisheries and resource access: Coastal communities depend on fishing. Negotiators must balance sovereign claims with practical access arrangements to prevent local flashpoints.
- Coast guard law and maritime militia: China’s coast guard law (and the de facto maritime militia) changes the calculus of encounters. Other states want clear rules limiting the use of coercive measures and specifying safe maneuvering protocols.
- Third-party involvement: The U.S. and allies push for freedom of navigation guarantees; Beijing views some of that as third-party interference. The room for compromise here is narrow.
Comparative snapshot: claimants and recent actions
| Claimant | Basis of claim | Notable recent actions |
|---|---|---|
| China | Historical maritime claims framed by the nine-dash line; rejects 2016 PCA ruling | Expanded reefs and outposts; coast guard law enforcement; diplomatic push for bilateral management |
| Philippines | Exclusive Economic Zone claims under UNCLOS; 2016 PCA ruling favored Philippines | Increased patrols, arbitration enforcement claims, bilateral talks with Beijing over fishing and resource access |
| Vietnam | Longstanding claim based on proximity and historic use | Naval and coast guard patrols; oil exploration disputes; legal protests in international fora |
| Malaysia | Exclusive Economic Zone and continental shelf claims in southern areas | Incremental offshore activity; prefers quiet diplomacy and technical solutions |
| Brunei | Limited claims around its EEZ | Low-profile diplomacy; focus on joint development options |
| Taiwan | Claims mirror China’s historic claims; political complexity due to status | Continued presence at some features; occasional coast guard confrontations |
That table compresses a complex set of positions. What matters for diplomacy is not only what each side claims on paper but the tools they use at sea — coast guard deployments, fishing fleets, and the degree to which military forces are kept at arm’s length.
What stabilizing diplomacy would look like
A credible, binding COC would do three things: (1) set clear procedures for incident management; (2) define cooperative mechanisms for resource sharing and joint development; and (3) create verification and dispute-resolution pathways that don’t immediately trigger armed escalation. In practice negotiators are proposing concrete mechanisms like notification of naval exercises, joint fisheries management committees, and hotlines between coast guards. Those measures are small individually, but together they lower the temperature of confrontations.
Economic stakes drive urgency. An estimate frequently cited by regional trade analysts puts the annual value of cargo transiting the South China Sea at roughly $3 trillion. That figure helps explain why the European Union and Japan donate diplomatic bandwidth and why shipping companies track developments closely: uncertainty raises insurance and rerouting costs fast.
Risks to watch and near-term scenarios
There are a handful of measurable indicators that will tell us whether diplomacy is gaining ground. First, frequency of coast guard and militia encounters — if these spike year-on-year, negotiators will have less latitude. Second, the degree of ASEAN unity: if ASEAN issues a joint negotiating text, it strengthens the bloc’s hand; if key members split, it undermines multilateral leverage. Third, transparency around hydrocarbon licensing: unilateral exploration projects near disputed features have repeatedly provoked standoffs.
Short-term scenarios range from cautious progress (incremental, sectoral agreements on fisheries and safety at sea) to stalemate punctuated by crises (unilateral incidents that escalate into broader military involvement). Outside powers will continue to complicate and to stabilize: their naval presence deters sudden seizures, but their rhetoric can harden positions in capitals unwilling to concede diplomatic space.
Diplomacy is never just about documents. It’s about trust, reciprocity, and the technical ability to make arrangements work at sea. Negotiators know this. So do fishermen who face the immediate risks. That ground-level perspective explains why some proposals focus less on grand legal language and more on simple, enforceable rules for how ships behave when they meet.
The single tactical metric that will tell us whether talks are succeeding is whether negotiators can move from declaratory text to operational, verifiable mechanisms — hotlines, incident-reporting templates, joint patrol zones — within the next negotiation cycle. That shift from principle to practice is the pivot between enduring instability and managed order.