WTO establishes the DS639 panel: CBAM faces its first panel review

The WTO Dispute Settlement Body established a panel in DS639 at its September 25, 2026 meeting, placing the EU carbon border adjustment mechanism under formal panel review for the first time. Establishment came at Russia's second request, 16 months after the dispute was filed, and the EU could not block it: after the EU blocked Russia's first WTO panel request on July 24, WTO rules made a second request quasi-automatic. No WTO panel has ever adjudicated a carbon border measure before.

Eighteen WTO members reserved third-party rights at the meeting itself, and the official case file has since grown to 25 third parties. The dispute now moves to panel composition, a realistic report window of 2027 to 2028, and an appeal stage that leads nowhere while the Appellate Body remains paralyzed. Importer obligations under Regulation (EU) 2023/956 do not change at any point in that sequence.

What happened at the September 25 DSB meeting

At its September 25, 2026 meeting, the WTO Dispute Settlement Body agreed to Russia's second request and established a panel to review the EU "CBAM Package" and an alleged export subsidy under the EU scheme for trading greenhouse gas emission allowances. Russia told the meeting that CBAM "creates significant trade barriers for covered goods imported into the EU" and repeated its position that free allocation of EU ETS allowances operates as an export subsidy supporting the competitiveness of selected EU industries.

The EU restated its objection but accepted the procedural outcome. In its statement published by the EU delegation to the WTO, the EU confirmed that "if a panel is established by the DSB pursuant to Article 6.1 of the DSU, consistent with the principle of negative consensus, the European Union will participate in the proceedings before the panel."

The WTO's summary of the meeting records that the EU would participate "not to legitimize Russia's actions, but to reaffirm the EU's strong support for the rules-based multilateral trading system," and the EU statement itself adds that the EU will "only engage with the panel and not directly with the Russian Federation." On the merits, the EU expressed confidence that its "Carbon Border Adjustment Mechanism and free allocation under the European Union Emissions Trading System are WTO-compatible."

Why the EU could not block the second request

Article 6.1 of the Dispute Settlement Understanding requires a panel to be established at the latest at the second DSB meeting where the request appears on the agenda, unless the DSB decides by consensus not to establish one. That reverse-consensus rule means Russia would have had to join a consensus against its own case for the panel to be refused, which is why second requests succeed as a matter of routine. The EU spent its single blocking opportunity on July 24.

The table below tracks the full procedural record of DS639 through the appeal stage.

The scope: the CBAM package and the free allocation subsidy claim

The established panel will examine both the CBAM package itself and Russia's claim that free allocation of EU ETS allowances is a prohibited export subsidy, the same two-front attack carried forward from Russia's WTO panel request against EU CBAM of July 10. The claims span GATT Articles I, II, III, X and XI, the Import Licensing Agreement, and the SCM Agreement. The claim families break down as listed below.

• Discrimination claims (GATT I and III): the carbon price deduction favors exporters from countries with carbon pricing, and CBAM burdens imports more than free-allocation-shielded EU production
• Tariff claims (GATT II): the certificate obligation operates as a charge in excess of the EU's bound tariff commitments
• Administration and restriction claims (GATT X and XI): CBAM's rules are administered non-uniformly and act as a disguised quantitative restriction
• Import licensing claims: the authorized CBAM declarant regime functions as an import licensing system that fails the agreement's neutrality requirements
• Subsidy claim (SCM Agreement): free allocation of EU ETS allowances to European producers is a prohibited subsidy

The subsidy claim keeps its 2026 bite because EU producers in CBAM sectors still receive 97.5 percent of their benchmark allocation for free this year, with the CBAM factor at 2.5 percent. The complete argument map on both sides, including the EU's expected Article XX environmental defense, sits on the WTO DS639 analysis page.

Eighteen third parties at the meeting, 25 on the case file

Eighteen WTO members reserved third-party rights at the September 25 meeting: Argentina, Brazil, Canada, China, India, Indonesia, Japan, Saudi Arabia, South Korea, Malaysia, Norway, Paraguay, Singapore, Switzerland, Chinese Taipei, Thailand, the United Kingdom, and the United States. The WTO's DS639 case file has since grown to 25 third parties, adding Colombia, Iceland, Kazakhstan, New Zealand, South Africa, Türkiye, and the United Arab Emirates, since members can notify third-party interest in the days after establishment.

The roster is a map of the carbon border debate. China and India, CBAM's loudest critics in WTO committees, get a formal seat without filing their own cases, and the United Kingdom joins while building its own CBAM for January 1, 2027. A panel report will be read as design guidance in every one of those capitals.

What happens next: composition, timeline, and the appeal void

The next step is panel composition: the parties try to agree on three panelists, and if there is no agreement within 20 days of establishment, either party can ask the WTO Director-General to appoint the panel. Given the EU's statement that it will not engage directly with Russia, composition by the Director-General is the likelier route. Only once the panel is composed does a working schedule exist for written submissions, hearings, and a report.

The realistic timeline for a DS639 report runs into 2027 or 2028. The DSU targets six to nine months of panel proceedings, but complex disputes routinely exceed that, and a first-ever review of a carbon border measure with 25 third parties sits at the complex end of the scale. The deeper caveat is the appeal stage. The Appellate Body has been unable to hear cases since December 2019, so the losing party can appeal the report "into the void," leaving it unadopted and unenforceable. The same September 25 meeting rehearsed that stalemate: Colombia presented the proposal to start Appellate Body appointments for the 100th time on behalf of 130 members, and the United States opposed it again.

What changes for importers while the panel sits: nothing

No importer obligation changes because of the panel establishment: Regulation (EU) 2023/956 remains fully in force, and WTO proceedings have no suspensive effect on EU law. Even an adverse report years from now would not repeal CBAM; it would ask the EU to bring the measure into conformity on a timetable decided in Brussels, and the appeal void makes even that scenario distant.

The compliance calendar continues exactly as before.

1. Authorized CBAM declarant status remains mandatory for imports above the 50-tonne annual de minimis threshold
2. Certificate sales begin February 1, 2027, with the quarterly requirement to hold at least 50 percent of cumulative embedded emissions
3. The first annual CBAM declaration, covering calendar year 2026, is due September 30, 2027

For importers of Russian-origin fertilizers and steel, the CBAM Russia country page tracks how the dispute sits alongside sanctions exposure and carbon costs. The next DS639 signal to watch is the composition notice: once three names appear on the case file, the clock starts on the first substantive test of carbon border policy under world trade law.