Enforcement of New York Convention awards and the limits of the public policy defence

In Hulley Enterprises Ltd & Ors v The Russian Federation [2026] EWHC 456 (Comm), the Commercial Court ordered the enforcement of three arbitration awards totalling over US$50 billion (plus interest and costs) arising from the expropriation of the Yukos oil company. 

The judgment addresses a number of issues that will be of interest to practitioners advising on (i) the enforcement of awards under the Convention on the Recognition and Enforcement of Foreign Arbitral Awards 1958 (the “New York Convention”) pursuant to s103 of the Arbitration Act 1996 (the “Act”), (ii) the scope and limits of the public policy defence, (iii) the distinction between illegality in the underlying transaction and illegality in the procurement of the investment, and (iv) the treatment of allegations of procedural fraud, including witness payments and concealment of documents.

Facts

The Claimants (i.e. Hulley Enterprises Limited, Veteran Petroleum Limited and Yukos Universal Limited) (“HVY”) were three companies incorporated in Cyprus and the Isle of Man, and formerly the majority shareholders in OAO Yukos Oil Company (“Yukos”). Their beneficial owners included various Russian individuals (the “Russian Individuals”).

HVY had acquired shares in Yukos through a series of transfers from entities that had participated in the original privatisation of Yukos in the 1990s.

The underlying dispute concerned HVY’s case that the Russian Federation unlawfully expropriated Yukos’s oil assets, in breach of its obligations under the Energy Charter Treaty (“ECT”), a multilateral treaty governing cross-border energy investment and trade.

Three arbitration awards (the “Final Awards”) were made by a tribunal seated in The Hague on 18 July 2014, ordering the Russian Federation to pay damages of over US$50 billion, plus interest and costs. 

The Russian Federation resisted enforcement before the Commercial Court under s103(3) of the Act, principally on public policy grounds. Its defence raised two broad categories of objection: 

1. allegations about the acquisition and operation of Yukos (including bribery in the original privatisation, alleged illegality in the share transfers to HVY, and tax fraud); and 
2. allegations of fraud in the arbitration proceedings themselves (concealment of documents and improper payments to a witness, Dr Illarionov).

The Dutch courts had already considered and rejected various challenges to the awards. 

Commercial Court Decision

The Commercial Court ordered that HVY were entitled to judgment against the Russian Federation in respect of the damages awarded (over US$50 billion plus compound interest), but not in respect of costs or interest on costs. The main reasons are set out below: 

The enforcement framework under s103

The New York Convention and sections 101 to 103 of the Act are inherently “pro-enforcement”, and that the threshold for a public policy objection is high. The grounds for refusing enforcement are to be construed narrowly, and the burden is on the party resisting enforcement to establish that one of the exceptions applies. Importantly, where the resisting party points to historic misconduct (such as bribery or fraud in connection with the underlying transaction), the court asks whether enforcing the award would be contrary to English public policy, and not whether the underlying dispute involved objectionable conduct.

The distinction between international and domestic public policy

There is a well-established distinction between English domestic public policy and international public policy in the enforcement context. Where a tribunal has found a contract (or investment) legal under its proper law, but it would be affected by illegality under English law, enforcement can only be refused if the relevant illegality reflects international public policy (i.e. “universal principles of morality”), rather than purely domestic public policy. Outside universally condemned activities such as terrorism, drug-trafficking and prostitution, it is principally allegations of fraud and corruption in international commerce that engage these rules. However, even then, not all fraud or corruption will suffice. The critical question is the degree of connection between the illegality and the contract or investment, as discussed below.

Bribery and the “degree of connection” test

There is a distinction between a contract to bribe and a contract merely procured by bribery. Drawing on RBRG Trading (UK) Ltd v Sinocore International Co Ltd [2018] EWCA Civ 838, Bright J summarised the applicable principles as follows:

1. A contract to bribe foreign public officials is contrary to international public policy, and an award enforcing such a contract may be refused.
2. A contract that has been procured by bribes but is not unlawful in itself is not sufficiently closely connected to the bribery that international public policy is engaged. The award on such a contract will be enforced. 
3. Even where a contract is performed by bribery, if the bribery is merely incidental, international public policy is not engaged. 

Applying this framework to the facts, the Commercial Court acknowledged that, under the classic ‘but for’ analysis, there was a causal connection between the alleged bribery in the original privatisation and HVY’s eventual shareholdings in Yukos—HVY had acquired their shares through a series of transfers from entities that participated in that privatisation—and therefore the Final Awards. The Russian Federation argued that these subsequent transfers could not sever the chain of causation or “cleanse” the tainted origins of the shares. To hold otherwise, Russia contended, would be to permit the “laundering [of] the proceeds of crime”. The Court acknowledged that Russia’s argument was a “morally weighty” one.

However, the Commercial Court rejected the argument and concluded that HVY’s investment (i.e. the subject-matter of the Final Awards) was, at most, one procured by bribery — that is, falling within the second category above. The underlying business (the oil and gas operations of Yukos) was not itself illegal or criminal. Accordingly, even accepting for present purposes the Russian Federation’s allegations of misconduct in the original privatisation, they did not render enforcement of the Final Awards contrary to English public policy.

Finality of tribunal findings

In the context of s103(3) of the Act, the English court is bound by the findings of fact and law made by the tribunal. Where a defendant asserts that enforcement would be contrary to public policy because of a particular fact or proposition of law, but the tribunal has already rejected that position, the court will take the tribunal’s decision as final and binding (in the absence of fraud or other vitiating factors). The Russian Federation could not go behind the tribunal’s finding that HVY’s own acquisitions of the Yukos shares were legal.

The Commercial Court also applied the Henderson v Henderson principle: where the Russian Federation had failed to raise certain allegations before the tribunal or the supervisory court, and could and should have done so, it was precluded from raising them in the enforcement proceedings. 

Fraud in the arbitration: concealed documents

As regards the allegation that HVY had intentionally and dishonestly concealed documents demonstrating that the Russian Individuals exercised control over HVY, the Commercial Court held that the control issue was of no relevance to the outcome of the arbitrations. Even if the concealed documents had been disclosed, the tribunal’s conclusions on admissibility, liability and quantum could never have been any different. 

However, the Commercial Court accepted that the dishonest concealment of disclosable documents would very likely have affected the tribunal’s award of costs (approximately US$50 million in the Hulley reference alone) which constituted “substantial injustice” (i.e. the legal threshold required to refuse enforcement on grounds of procedural fraud, assessed by reference to whether the misconduct affected the tribunal’s actual reasoning and conclusions). On this basis, the Commercial Court declined to enforce the costs element of the awards.

Fraud in the arbitration: witness payments

The Russian Federation alleged that HVY had paid Dr Illarionov, one of the witnesses, a bribe of US$200,000 in exchange for favourable testimony, and that this constituted a fraud on the tribunal.

The Commercial Court rejected this argument. It noted that the Re-Amended Defence failed properly to plead that Dr Illarionov’s evidence was untruthful or that HVY had sought to influence its content. The Court also found that paying a factual witness is permissible under English law and is not inherently immoral or dishonest, provided the payment is not contingent on the nature of the evidence or the outcome of the case. There was no obligation on HVY to volunteer information about the fee.

The Commercial Court further held that the payment was not wrongful under Dutch criminal law or any identified principle of international arbitration rules or practice. 

Comment

The decision has a number of significant points for practitioners:

Pro-enforcement framework

The judgment is a powerful reaffirmation of the pro-enforcement regime under the New York Convention pursuant to s103 of the Act. The court will not readily permit public policy arguments to frustrate enforcement, and the threshold remains high. The Commercial Court noted that “litigation of this kind is not a moral beauty contest” and that the pro-enforcement regime “can be relied on by sinners, no less than by saints”. This may offer some cold comfort to parties whose conduct is the subject of criticism, provided the legal framework is on their side.

However, there is a potential tension between these principles and modern anti-money laundering and anti-corruption frameworks. While a contract or award may remain enforceable for the purposes of arbitration law and the public policy exception, an award may nevertheless be tainted by allegations of bribery or corruption. Financial institutions, funders and other market participants may be reluctant to deal with assets or proceeds where such allegations exist, and organisations involved in the payment, enforcement or monetisation of an award may be required to consider whether separate compliance, due diligence or reporting concerns arise. The case therefore illustrates that legal enforceability and financial crime risk do not always point in the same direction.

Bribery and the “degree of connection” test

The bribery distinction (i.e. between a contract to bribe and one merely procured by bribery) had previously been developed in the contractual context. Hulley confirms that it applies equally to investment treaty arbitration. Even where an investment structure has criminal origins, the court will look at what the investment actually is, not how it came about.

Aligned with our comments above, there is perhaps a tension here with modern anti-money laundering and anti-corruption frameworks. It remains to be seen whether the courts and Parliament will remain comfortable with this distinction – which has the effect of potentially allowing contracts procured by bribery (and other unlawful acts) to be indirectly enforced in England through arbitration.

Arbitrations do not take place in the glare of public scrutiny, which may bring wrongdoing to light through media attention, nor do arbitrators (or arbitrations) have the power of individual sanction of domestic courts. As such, there is always the potential for them to become a ‘soft route’ to wrongdoing or enforcing wrongdoing. Questions will remain as to whether the approach of domestic courts to enforcement of arbitral awards, in the United Kingdom and globally, reflects the proper approach to the risk of deterring wrongdoing.