Russian oligarch Vladimir Potanin, who runs the world's largest nickel producer, and Natalia Potanina divorced last year.
At the time, Potanin offered his wife of 30 years a settlement including a monthly allowance of $250,000 (that's $3 million a year) — as well as properties in Moscow, London, and New York.
But Potanina says she deserves way more from the richest man in the country, worth an estimated $15.4 billion according to Russia's Forbes.
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