Cambodia becomes the 62nd WTO member to sign on to the interim appeals pact, lifting its coverage to 60.4 percent of world trade as the Appellate Body enters its seventh year of paralysis and dispute settlement reform stalls.
By Peacock Tariff Consulting Trade Desk | peacocktariffconsulting.com | September 10, 2026
A small economy makes a big statement
GENEVA, September 10, 2026. Cambodia has joined the Multi-Party Interim Appeal Arbitration Arrangement, the stopgap appeals mechanism that a growing bloc of World Trade Organization members has built around the ruins of the WTO Appellate Body, becoming the 62nd member of the world trade body to sign on to the pact. The European Union, which has championed the arrangement since its creation in 2020, welcomed the move on September 9, saying Phnom Penh’s accession contributes to efforts to uphold a rules-based multilateral trading system at a moment when that system is under sustained strain.
With Cambodia’s participation, the MPIA now covers 62 WTO members that together account for 60.4 percent of world trade, according to the European Commission. The Geneva trade publication Borderlex reported that Cambodia signalled its intention to join in a communication to the WTO secretariat, in which the Southeast Asian country said it “supports the objectives of the MPIA and reaffirms its commitment to achieving a fully functioning and effective dispute settlement system accessible to all members.”
The accession of a least developed country with an export machine built on duty-free preferences might look like a footnote in the long-running saga of WTO dispute settlement reform. It is anything but. Cambodia’s decision extends the arrangement’s reach deeper into Southeast Asia, one of the fastest growing nodes in global supply chains, and it signals that smaller trading nations increasingly see binding, appealable dispute settlement as insurance worth buying in an era of unilateral tariffs and fraying multilateral discipline.
“I welcome Cambodia to the MPIA. The arrangement plays an important role in upholding the rules-based trading system. Each new participant helps reinforce the predictability, stability and credibility of global trade rules. I encourage other WTO members to join the MPIA,” said EU Trade and Economic Security Commissioner Maros Sefcovic in the Commission’s statement.
A body paralyzed, a void filled
To understand why 62 governments have signed on to what was designed as a temporary workaround, one has to go back to December 11, 2019. On that day, the WTO Appellate Body, the standing seven-member tribunal that for a quarter century served as the final word in global trade disputes, ceased to function. The United States, under successive administrations of both parties, had blocked all appointments and reappointments to the body, citing concerns over judicial overreach, the tribunal’s treatment of precedent, repeated failures to meet deadlines, and findings on trade remedy rules that Washington viewed as inventions unsupported by the negotiated texts. When the terms of two of the last three members expired, the body fell below the quorum of three needed to hear any appeal.
The consequences were immediate and corrosive. Under WTO rules, a panel report that is appealed cannot be adopted until the appeal is resolved. With no Appellate Body to resolve anything, a losing party could file an appeal knowing it would never be heard, a tactic that trade lawyers quickly dubbed “appealing into the void.” Dozens of panel reports have since been suspended in legal limbo, unenforceable and unadopted. For governments and companies that had spent years and millions of dollars litigating disputes over tariffs, subsidies, and trade remedies, the void turned hard-won panel victories into paper judgments.
The MPIA was the response of members determined not to let the appeals function die entirely. Conceived in early 2020 and formally notified to the WTO in April of that year by an initial group that included the European Union, China, Canada, Brazil, Australia, and a dozen other members, the arrangement rests on Article 25 of the WTO Dispute Settlement Understanding, which permits parties to resolve disputes through arbitration by mutual agreement. Participants agree in advance that, in disputes among themselves, appeals from panel reports will go to arbitration under agreed procedures modeled closely on Appellate Body review, rather than into the void.
Under the arrangement, appeals are heard by three arbitrators drawn by random selection from a standing pool of ten appeal arbitrators established by the participating members. The Commission describes the pool as composed of persons of recognized authority with demonstrated expertise in law, international trade, and the WTO agreements. The pool was refreshed effective June 1, 2025, to ensure appeals continue to be heard by independent arbitrators, and the arrangement remains open to any WTO member willing to accept its disciplines.
From experiment to institution
What began as a coalition of roughly twenty members has grown into something closer to a parallel institution. The membership now spans every continent and every level of development. Alongside the EU and its member states, participants include Australia, Barbados, Benin, Brazil, Canada, China, Chile, Colombia, Costa Rica, Ecuador, Guatemala, Hong Kong (China), Iceland, Japan, Liechtenstein, Macao (China), Malaysia, Mexico, Moldova, Montenegro, New Zealand, Nicaragua, Norway, Pakistan, Paraguay, Peru, the Philippines, Singapore, Switzerland, Ukraine, the United Kingdom, Uruguay, Vietnam, and now Cambodia. The United Kingdom’s accession in June 2025 was hailed by Brussels as a strengthening of the multilateral trading order; Cambodia’s arrival barely a year later pushes the arrangement past the symbolic threshold of 60 percent of world trade.
The arrangement has also proven itself in practice. Its first award, issued on December 21, 2022, resolved the appeal in Colombia’s dispute with the EU over anti-dumping duties on frozen fries from Belgium, Germany, and the Netherlands. The three arbitrators overturned one panel finding in Colombia’s favor but otherwise upheld the panel’s conclusions, and both sides accepted the outcome, demonstrating that appeal by arbitration could deliver a binding, orderly result on a contested trade remedy measure. Subsequent disputes among participants have moved through the mechanism, and trade law practitioners now routinely advise clients that MPIA membership determines whether a WTO case can actually reach a final, enforceable conclusion.
The political weight behind the arrangement was on display at the WTO’s 14th Ministerial Conference in Yaounde, Cameroon, this past March. With negotiations on restoring a fully functioning dispute settlement system reduced, in the words of one Geneva analyst, to little more than a footnote in the conference outcome, ministers from what were then 61 MPIA participants issued a joint statement stressing the arrangement’s importance for the stability, security, and predictability of international trade, pending reform of the WTO system. The WTO Director-General, for her part, described the MPIA as a practical, confidence-building bridge while members work toward a permanent reform deal.
Why Cambodia, and why now
Cambodia’s decision fits a clear strategic logic. The country, which acceded to the WTO in 2004 as one of the first least developed countries to join through a full negotiation, runs an export economy that is unusually dependent on stable, predictable access to rich country markets. Garments, footwear, and travel goods accounted for roughly 65 percent of its merchandise exports as of 2022, according to the WTO’s most recent trade policy review of the country, and the sector employed about 670,000 workers, more than 80 percent of them women. Agricultural exports such as rice and cashew nuts round out a narrow export basket.
Much of that trade flows on preferences rather than negotiated reciprocity. Cambodia ships to the European Union largely under the Everything But Arms scheme, which grants least developed countries duty-free, quota-free access for all products except weapons. Those preferences have been both a lifeline and a vulnerability: the EU partially suspended Cambodia’s EBA benefits in 2020 over human rights concerns, a reminder that unilateral preferences can be withdrawn unilaterally. Even so, the relationship has deepened; Cambodian exports to the EU reached about 4.2 billion dollars in the first ten months of 2025, up more than 17 percent year on year, according to figures reported in the Cambodian press.
The bigger shift on the horizon is graduation. Cambodia has met the United Nations criteria to leave the least developed country category and is preparing for graduation expected around 2029. Graduation will eventually cost Phnom Penh its EBA access and push it toward standard GSP arrangements with higher tariffs and stricter rules of origin, and ultimately toward trading relationships governed by ordinary WTO commitments. In that world, the ability to enforce WTO rights through binding dispute settlement stops being an abstraction and becomes commercial infrastructure. A country that will increasingly trade on rules rather than charity has an obvious interest in making sure the rules can be enforced, and that its trading partners cannot appeal adverse rulings into the void.
There is also a regional dimension. Cambodia joins Vietnam, the Philippines, Singapore, Malaysia, Hong Kong, and Macao among Asian participants, meaning a substantial share of the Southeast Asian manufacturing belt now sits inside the arrangement. As supply chains have shifted toward the region, driven in part by tariff escalation between the United States and China, the volume of trade that could someday be contested in Geneva has grown with it. For ASEAN economies courting investment on the promise of stable market access, MPIA membership is a low-cost credibility signal.
What it means for tariff disputes
The practical significance of the arrangement is easiest to see in the disputes that dominate today’s trade agenda. Anti-dumping and countervailing duty measures, safeguard tariffs, and discriminatory subsidy schemes are the bread and butter of WTO litigation. When both parties to such a dispute are MPIA participants, the losing side retains a genuine right of appeal, and the winning side retains a genuine prospect of enforcement, including the ultimate remedy of authorized retaliation if the losing party fails to comply. When one party is outside the arrangement, none of that is assured.
That asymmetry increasingly shapes litigation strategy. Governments weighing whether to challenge a trading partner’s tariff measure now ask, first, whether the respondent is an MPIA participant. If it is, the case can run to a binding conclusion. If it is not, the complainant must weigh the risk that years of panel proceedings end in an unadopted report. The most consequential absence remains the United States, which has declined to join the arrangement and has continued to appeal adverse panel reports into the void, including in high-profile disputes over its Section 232 steel and aluminum tariffs. No MPIA expansion changes that, and officials in Brussels and Geneva are candid that the arrangement is a bridge, not a destination.
Still, the economics of a 62-member arrangement covering three fifths of world trade are not trivial. Trade economists have long argued that enforceable dispute settlement functions as a stabilizer: it lowers the perceived risk of arbitrary market closure, which in turn supports investment in export capacity and cross-border supply relationships. Studies of the WTO era consistently associate credible enforcement with deeper trade flows, particularly for smaller economies that lack the market power to retaliate effectively on their own. For a country like Cambodia, whose entire development model depends on foreign buyers trusting that its market access will not evaporate, the insurance value of binding appeals may exceed anything it will ever win in an actual case. Cambodia has never been a party to a WTO dispute as complainant or respondent, and may never be. The point is the option.
Implications for importers, exporters, and supply chains
For companies, the arrangement’s growth carries several concrete implications. First, sourcing and market diversification decisions increasingly factor in dispute settlement coverage. A procurement manager choosing between suppliers in two countries faces different regulatory risk profiles if one country’s government can enforce its WTO rights through the MPIA and the other cannot. Trade counsel at multinational firms have begun mapping MPIA membership onto supply chain footprints in the same way they map free trade agreement coverage and sanctions exposure.
Second, the arrangement matters for the durability of trade remedy outcomes. Importers who pay anti-dumping or countervailing duties, and exporters whose goods are targeted by them, have a direct financial stake in whether a successful legal challenge to those duties can be brought to a final conclusion. Within the MPIA membership, a duty found to violate WTO rules faces real pressure toward removal or adjustment. Outside it, a non-compliant duty can persist indefinitely behind a void appeal. As more of world trade comes under the arrangement, the universe of tariff measures subject to effective legal discipline expands accordingly.
Third, there is a systemic signal. The past two years have seen the broadest resort to unilateral tariff action since the founding of the GATT, with the United States applying sweeping tariffs across trading partners and others responding with their own measures. Against that backdrop, every accession to the MPIA is a small vote for the proposition that trade disputes should be adjudicated rather than escalated. The arrangement brings together participants from all continents and at different levels of development, as the Commission put it in its statement, united by a shared commitment to upholding the rules-based trading system. That coalition-building has value independent of any single case, because it preserves the institutional muscle memory of binding dispute settlement for the day a broader reform becomes possible.
There are practical caveats. The MPIA binds only disputes between participants, so a Cambodian exporter injured by a measure imposed by a non-participant gains nothing new from Phnom Penh’s accession. Arbitration awards under Article 25 also sit on slightly different legal footing than adopted Appellate Body reports, though participants have committed to treat them as binding, and compliance to date has held. And the arrangement does not solve the resource problem that has always kept least developed countries on the sidelines of WTO litigation: panel proceedings routinely cost millions of dollars in legal fees, which is one reason the Advisory Centre on WTO Law, which provides subsidized counsel to developing country members, is expected to figure prominently in any future Cambodian case.
Customs brokers, sourcing executives, and trade compliance teams should also note what the accession does not change in the near term. Cambodia’s applied tariff schedule, its EBA preferences in the EU market, and its treatment under other GSP programs are all unaffected. Rules of origin, duty rates, and documentation requirements for goods moving in and out of Cambodia remain exactly as they were last week. What changes is the legal weather at the system level: one more sizable garment and footwear supplier now sits inside the enforceable core of the trading system, and one more government has committed in writing to resolve its future trade fights through arbitration rather than attrition.
The reform question that will not go away
None of this resolves the underlying institutional crisis. WTO members committed at successive ministerial conferences to restore a fully functioning dispute settlement system accessible to all members, originally targeting 2024, a deadline that came and went. Talks facilitated in Geneva have produced convergence on much of the technical architecture but remain stuck on the hardest question: the form and powers of a permanent appellate mechanism, the very issue that led Washington to strangle the Appellate Body in the first place. The MC14 outcome in Yaounde relegated dispute settlement reform to continued consultations, disappointing delegations that had hoped for a concrete workplan.
In the meantime, the MPIA keeps growing, and each accession subtly shifts the negotiating landscape. Some Geneva observers argue that if the arrangement continues to expand, it could become the de facto default appeals system, presenting future reform talks with a functioning model rather than a blank page. Others caution that a two-track system, with binding appeals for participants and a void for everyone else, entrenches exactly the fragmentation the WTO was built to prevent. Both camps agree on one thing: the arrangement’s credibility depends on the breadth of its membership, which is why Brussels greets each new participant, however small its trade footprint, with visible enthusiasm.
Cambodia’s accession will not decide any of these debates. But it adds a data point that trade diplomats will cite for years: a least developed country on the cusp of graduation, with no WTO litigation history and every reason to keep its head down, looked at the state of the multilateral trading system in 2026 and concluded that binding, appealable dispute settlement was worth signing up for. For a system whose obituary has been written many times since 2019, that is a quiet but unmistakable vote of confidence. The MPIA, born as a temporary bridge, now carries more than 60 percent of world trade across the gap. The question for the WTO’s members is how long a bridge can keep lengthening before it becomes the road.