Hetem Ramadani, 63, has labelled his former spouse a 'divorce tourist' who is intent on taking advantage of the 'very generous' English courts.
The couple, who married in 1981 and have four grown-up children, made their fortune in Slovenia in the early 1990s after fleeing Kosovo as refugees.
But Hazbije Ramadani, 58, moved to London with her children in 2008 after withdrawing around £3.5 million from the pair’s joint bank account, London’s Appeal Court heard.
Her husband relocated to Dubai around the same time and the couple's 30-year marriage was 'dissolved' by a Slovenian court in 2011.
Last year family judge Mr Justice Moylan gave Mrs Ramadani the go-ahead to claim spousal maintenance in an English divorce court.
But Mr Ramadani challenged the decision, saying it was unfair for her to have 'a second bite of the maintenance cherry' in the English courts which he said were known for their generosity to dependants.
Today, Lord Justice McFarlane said Mr Ramadani had 'fallen a long way short' in his quest to stop his ex claiming a share of his millions.
She had withdrawn her maintenance claim in Slovenia and was free to move the fight to England, he ruled.
The judge, sitting with Lady Justice Black and Lord Justice Sales, also refused Mr Ramadani's bid to have the case referred to the European Court of Justice.
The ex-couple's assets are spread across Europe, Dubai and the Caribbean and once included a Slovenian mansion reputed to be the country's largest privately owned home.
Mr Ramadani is currently the boss of Salbatring – a Slovenian oil and commodities company.
On the company’s website, he calls for modern managers to become 'meditative and transcendental leaders' and he has also written a book called Health and Wealth through Meditation.
Also a philanthropist and keen art collector, Mr Ramadani is now married to opera singer, Inva Mula.