Facts and procedural background

The claimant was a company incorporated in Angola and active in the diamond and minerals sector. The respondent was a Swiss-based individual against whom the claimant had obtained a partial final award and a final award on costs, ordering payment of approximately CHF 368,000. Relying on the costs award, the claimant initiated domestic debt enforcement proceedings in Switzerland. After the debtor lodged an objection against the enforcement, the claimant requested the objection to be set aside in summary proceedings based on the arbitral awards (definitive Rechtsöffnung). The District Court of Aarau granted the request. On appeal by the debtor, however, the Cantonal Court of Aargau overturned that decision and dismissed the application of the claimant, holding that the claim could no longer be enforced due to international sanctions adopted in connection with the war in Ukraine. The claimant then brought the matter before the Swiss Federal Supreme Court.

Key legal reasoning of the Federal Supreme Court

The Federal Supreme Court upheld the judgment of the Cantonal Court and dismissed the appeal filed by the claimant. Central to its reasoning was the application of the Swiss Ordinance on Measures in Connection with the Situation in Ukraine (the Ukraine Ordinance). The Court accepted the lower court’s finding that, despite its Angolan seat, the claimant was effectively controlled by a sanctioned entity. This conclusion was based on the overall control structure and factual circumstances, including shareholders, corporate governance, and the presence of Russian nationals in key management positions. As a result, any payment to the claimant would have been prohibited under the applicable sanctions regime.

The Cantonal Court qualified this prohibition as a case of legal impossibility within the meaning of Article 119(1) of the Swiss Code of Obligations. Since the debtor was legally barred from performing, and since the duration of the sanctions was objectively unforeseeable and potentially long term, the impossibility was not merely temporary. The Cantonal Court therefore found that the claim had extinguished as a matter of law. Importantly, the existence of a final and binding arbitral award did not alter this conclusion: even a formally valid enforcement title cannot justify performance that is prohibited by mandatory public law. The Federal Supreme Court did not question the conclusion of the Cantonal Court, but also did not take a firm stance, since it held the view that even if the claim was not extinguished, it would at least be subject to an enforcement moratorium for as long as the sanctions are in place.

The claimant’s further objections regarding the assessment of evidence and the application of procedural law were rejected, as the Court found no arbitrariness or misapplication of federal law. Importantly, the Federal Supreme Court noted that due to the mandatory public law nature of sanctions, courts should examine and retain an enforcement moratorium ex officio, even when the debtor has not raised or proved that defence.

Significance and broader implications

This decision is of considerable practical and doctrinal importance. It clarifies that international sanctions may affect not only the enforceability but also the very existence or subsistence of private law claims under Swiss law, where performance is permanently or indefinitely prohibited. The judgment also underscores that, when assessing the control structure of a company and the reach of sanctions, courts must look beyond formal criteria such as a company’s place of incorporation and examine the particular circumstances of the case at hand. More generally, the ruling illustrates the limits of enforcement of arbitral awards in the face of overriding mandatory public law and highlights the need for parties and practitioners to assess sanctions risks at every stage, including enforcement proceedings.