What does the Potanina v Potanin Case mean for divorce law in the UK?
When “divorce tourism” meets the English family court system, it stirs major questions. That is precisely what happened in Potanina v Potanin. The headline-grabbing case involved a multi-billion-pound claim from the ex-wife of Russian oligarch Vladimir Potanin. The Court of Appeal recently ruled that Natalia Potanina can pursue her financial relief claim under Part III of the Matrimonial and Family Proceedings Act 1984. A decision that has one again put the English Family Court in the spotlight for international couples.
Message the Family Law team to discuss a divorce
What Happened in Potanina v Potanin?
Natalia Potanina and Vladimir Potanin were married in Russia in 1983 and divorced there in 2014 after around 30 years of marriage. The Russian divorce award gave Mrs Potanina a relatively modest sum (just tens of millions). While her ex-husband’s wealth, largely held via trusts and corporate structures, was argued to amount to billions. Her case was she had received less then 1% of the marital assets.
In 2019, Mrs Potanina sought leave to apply for financial relief in England under Part III of the 1984 Act, a mechanism for financial claims to be brought after a foreign divorce in certain cases. The High Court initially granted leave at a “without notice” hearing. However, this was later set aside.
The couple’s legal journey continued through the Court of Appeal and then the Supreme Court. In January 2024, the Supreme Court asked the Court of Appeal to re-consider the matter.
On 4 September 2025, the Court of Appeal granted Mrs Potanina permission to proceed, finding she had a “real and meaningful connection” to England. They also found that the disparity between her Russian settlement and what she could receive here was substantial. Her investor visa, London home, and change of residency were key factors.
So, what does it mean for divorce law in the UK?
1. Reaffirming London as the “Divorce Capital of the World”
This ruling reinforces the Family Court of England and Wales as a leading jurisdiction for high-value international divorce claims, with London at the centre of this. Previously the High Court, rejecting the application, had said that otherwise there would be “no limit to divorce tourism”. The Court of Appeals disagrees, meaning this lengthy Court saga will continue and most likely hit the headlines.
2. Clarifying the Part III Threshold
The judgment refines the test for Part III permission. Applicants must show a substantial ground, which the Court defined in this context as “solid.”
3. Allowing Justice Where Foreign Settlements Fall Short
In Mrs Potanina’s case, she received an original award in Russia which many view as vastly out of proportion given the marital wealth accumulated. The Court recognised that, where foreign proceedings fail to consider beneficial interests or provide fair outcomes, the English courts may step in. That is provided that the required jurisdictional tests are met.
4. Risks for Court Capacity and “Divorce Tourism”
While many praise the fairness of the decision, others warn it could strain the family court system. Some critics argue the ruling could invite a surge in high-net-worth claims from overseas, testing the limits of what the over-burdened English courts can manage. Clearly, cases such as the Potanina case will not trouble the Court every day.
What Comes after Potanina v Potanin?
With leave now granted, Mrs Potanina’s case will return to the Family Division of the High Court for a full financial remedies hearing under English law. This could become one of the largest divorce settlements on record, potentially involving billions.
Meanwhile, this decision will likely shape how international clients and their lawyers view jurisdiction, pre-divorce planning, and the role of Part III proceedings.
