Potanina v Potanin [2026] EWFC 80: The Next Chapter in One of the World's Largest Divorce Disputes Potanina v Potanin [2026] EWFC 80

The long-running litigation between Natalia Potanina and Vladimir Potanin returned to the Family Court in Potanina v Potanin (Case Management) [2026] EWFC 80, where MacDonald J considered a series of important case management issues following the Court of Appeal's decision to grant the wife permission to pursue financial relief in England under Part III of the Matrimonial and Family Proceedings Act 1984.
Although the hearing concerned procedural matters rather than substantive financial claims, the judgment provides valuable guidance on the Family Court's approach to case management in large-scale international financial remedy litigation. It also illustrates the challenges faced when domestic proceedings intersect with foreign litigation, sanctions regimes and complex international wealth structures.
Background
Natalia Potanina and Vladimir Potanin married in the former Soviet Union in 1983 and divorced in Russia in 2014 after a marriage lasting more than thirty years. During the marriage, the husband amassed enormous wealth, including interests in major Russian businesses. The wife contends that she received only a tiny fraction of the marital wealth on divorce because Russian law did not take account of assets beneficially owned by the husband through corporate and trust structures.
Following extensive litigation in Russia and other jurisdictions, the wife moved to England and sought permission to bring a claim for financial relief under Part III of the Matrimonial and Family Proceedings Act 1984. After years of litigation in the Family Court, the Court of Appeal and the Supreme Court, the Court of Appeal ultimately granted the wife leave to pursue her claim. The matter therefore returned to the Family Division for substantive case management.
What Is Part III of the Matrimonial and Family Proceedings Act 1984?
Part III enables a spouse who has obtained a foreign divorce to seek financial relief in England and Wales in limited circumstances.
The jurisdiction exists to alleviate injustice where the financial consequences of an overseas divorce leave one party inadequately provided for. However, the English court will only entertain such claims where there is a sufficient jurisdictional connection and where the applicant can demonstrate substantial grounds for bringing the claim.
Part III applications have often been described as a remedy designed to prevent serious unfairness rather than to permit a simple re-litigation of foreign divorce proceedings.
The Issues Before MacDonald J
At this case management hearing, MacDonald J considered several important procedural applications, including:
- whether the English proceedings should be adjourned pending proceedings in Russia;
- whether there should be a preliminary or split hearing;
- whether a previous stay on disclosure should be lifted;
- whether expert evidence on Russian law was necessary; and
- how issues relating to UK financial sanctions and licensing should be addressed.
Adjournment Refused
The husband sought an adjournment of the English proceedings pending developments in Russian litigation.
MacDonald J refused that application.
The decision reflects the Family Court's reluctance to permit foreign proceedings to derail or indefinitely delay domestic litigation, particularly where the English court has already determined that it has jurisdiction and that the applicant should be permitted to proceed.
The judgment demonstrates the court's commitment to ensuring that Part III claims progress efficiently once permission has been granted.
No Split Hearing
The husband also invited the court to direct a split hearing.
The court declined to do so.
Split hearings can sometimes promote efficiency where discrete issues can conveniently be determined in advance. However, in complex international financial remedy proceedings, the issues are frequently so intertwined that fragmentation may increase cost and delay rather than reduce it.
MacDonald J concluded that the interests of justice favoured the progression of the case towards a single final hearing.
Disclosure Remains Central
A particularly significant aspect of the judgment was the court's decision to lift a stay on disclosure.
Disclosure lies at the heart of financial remedy proceedings. The Family Court cannot properly determine claims involving vast international wealth without a full understanding of the nature, ownership and value of the relevant assets.
The decision underscores the long-established principle that transparency remains fundamental, even in exceptionally complex international cases involving offshore structures, foreign proceedings and allegations concerning beneficial ownership.
The Impact of Sanctions
An unusual feature of this litigation is that the husband is subject to UK sanctions.
As a result, any financial award made by the court may require authorisation from the Office of Financial Sanctions Implementation (OFSI).
MacDonald J therefore had to consider directions concerning sanctions licensing as part of the broader case management exercise. The judgment highlights the increasingly important intersection between family law and sanctions law in international financial remedy cases.
Key Principles Emerging from the Case
1. Permission Is Only the Beginning
Obtaining leave under Part III does not determine the substantive claim. It merely allows the applicant to proceed to the next stage.
2. The Court Will Act Robustly to Progress Proceedings
Once jurisdiction has been established, the Family Court is unlikely to permit repeated procedural applications to prevent a case from advancing.
3. Full Disclosure Remains Essential
Complex ownership structures, trusts and offshore entities do not diminish the obligation to provide proper disclosure.
4. International Cases Raise Increasingly Complex Procedural Issues
Modern financial remedy litigation may involve:
- multiple jurisdictions;
- competing foreign proceedings;
- sanctions regimes;
- expert evidence on foreign law; and
- sophisticated corporate structures.
Why This Case Matters
Although this judgment concerns case management rather than substantive relief, it is important because it demonstrates how the Family Court intends to manage one of the largest and most complex financial claims ever brought in England and Wales.
The case also serves as a reminder that Part III of the Matrimonial and Family Proceedings Act 1984 continues to play a vital role in addressing potential unfairness arising from overseas divorce proceedings.
Conclusion
Potanina v Potanin [2026] EWFC 80 marks the latest chapter in a litigation saga that has already spanned multiple jurisdictions and several appellate courts.
MacDonald J's robust case management approach signals that, once permission has been granted under Part III, the court expects proceedings to move forward efficiently notwithstanding the complexity of the international landscape.
For practitioners, the case offers valuable insight into the management of large-scale international financial remedy litigation and the increasingly significant interaction between family law, foreign proceedings and sanctions regimes.
Keywords: Potanina v Potanin, Part III MFPA 1984, international divorce, foreign divorce, financial remedies, sanctions, MacDonald J, family law, divorce tourism, international family law.
Read the full judgment here
For Family Law Advice and family court representation, contact Stephanie Heijdra Public Access Family barrister via sheijdra[@]winvolvedlegal.co.uk





