Hulley Enterprises Limited and others v The Russian Federation

Hulley Enterprises Ltd, Yukos Universal Ltd and Veteran Petroleum Ltd were, directly or indirectly, majority shareholders of the Russian oil company OAO Yukos Oil from 1999 until its liquidation in 2007. In 2004 they began arbitrations against the Russian Federation under Art 26 of the Energy Charter Treaty (ECT), which Russia had signed but never ratified, alleging that it had expropriated their investments. A tribunal seated in The Hague upheld jurisdiction in interim awards in 2009 and, in final awards of 18 July 2014, awarded Hulley US$39,971,834,360, Yukos Universal US$1,846,000,687 and Veteran US$8,203,032,751.

Russia applied to the Dutch courts to set the awards aside. The District Court of The Hague did so, but The Hague Court of Appeal reversed that decision on 18 February 2020. On 5 November 2021 the Supreme Court of the Netherlands rejected Russia's cassation grounds on the tribunal's jurisdiction, referring only a separate fraud point onward. In England, courts held that Russia was estopped by the Dutch judgments from re-arguing whether it had agreed to arbitrate.

In Singapore, the claimants obtained an ex parte order on 20 May 2024 permitting enforcement of the awards. Russia applied in HC/SUM 286/2025 for a declaration that it was immune under s 3(1) of the State Immunity Act 1979 (SIA), arguing that the arbitration exception in s 11(1) did not apply because it had never agreed in writing to arbitrate. The case was transferred to the Singapore International Commercial Court, where Andre Maniam J, James Allsop IJ and Anthony Meagher IJ heard preliminary issues first.

1. Whether Republic of India v Deutsche Telekom AG binds the court to apply transnational issue estoppel to questions of state immunity
2. Whether the requirements for transnational issue estoppel arising from the Dutch appellate judgments were met
3. Whether a de novo review, the limits of statutory jurisdiction or Singapore's international obligations excluded the estoppel

The majority (Maniam J and Meagher IJ) held that it was part of the ratio of The Republic of India v Deutsche Telekom AG [2024] 1 SLR 56 that transnational issue estoppel applies in international commercial arbitration even when it decides a question of state immunity. India there had relied on immunity as the starting point of its challenge, and the Court of Appeal resolved that question through the estoppel. The narrow exception for points decided without argument did not apply, because that court must have applied its mind to the point.

The requirements were met and largely undisputed. The Dutch appellate decisions were final, conclusive and on the merits. Russia had itself invoked the Dutch courts' jurisdiction. The parties were the same, and the issue decided, whether Russia had agreed in writing to arbitrate these disputes, was the issue under s 11(1). No defence to recognition, perversity, public policy objection or special circumstance was shown.

Russia's further arguments failed. A de novo hearing on jurisdiction means no deference to a tribunal's own ruling; it does not exclude an estoppel arising from a seat court's decision. The estoppel did not enlarge the court's jurisdiction, because the court still made findings under Singapore law that the exception's elements existed. International law operates in Singapore only as adopted, here through the SIA, whose exceptions treat agreements to arbitrate as private-law transactions to be resolved in adversarial litigation.

Allsop IJ concurred. He questioned whether issue estoppel, which assumes the earlier decision may be wrong, should settle a State's claim that it never consented to arbitration at all, as in Russia's argument on provisional application. He suggested the Primacy Principle might allow some review, but held that such questions were for the Court of Appeal.

The court dismissed Russia's claim to immunity, holding that it was precluded by issue estoppels arising from the Dutch appellate decisions from denying that it had agreed in writing to arbitrate, so the s 11(1) exception applied. Russia was not entitled to the declaration or to have the enforcement order set aside on immunity grounds. The court did not need to consider the Primacy Principle and invited Russia to state any remaining non-immunity grounds before further directions.