Russian President Vladimir Putin with Interros president Vladimir Potanin, second from right, outside the Black Sea resort of Sochi, Russia, in 2013. REUTERS/Ivan Sekretarev/Pool 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.

"Natalia claims Potanin's real wealth is held in offshore companies, and she's launched an international legal battle to get hold of it," CNN reports.

Under Russian law, anything acquired during marriage "should be divided equally" in a divorce.

And Potanina is arguing that, consequently, she deserves that half share. (For what it's worth, half of $15 billion could "buy her the New York Yankees twice, four Buckingham Palaces, or 14 Airbus super jumbos," according to CNN.)

In any case, Potanina knows what she'd do with the money.

"I want to give my shares to the state," she told CNN. "I want to avoid corporate conflicts. I want such a big strategic object to be under the state control."

Legal experts recently told The Moscow Times that Potanina faced an uphill battle, as Russian courts do not usually take the time to investigate the elaborate legal schemes that oligarchs use to hide their wealth.

"Our courts want to limit the time they spend on the trial; often they will make a ruling based on the documents presented and refuse to wait for additional evidence," Yana Teplyakova, a Moscow lawyer who has dealt with a number of high-profile divorce cases, told The Moscow Times.

The 134-meter-long super yacht "Serene," owned by Potanin, in Valletta's Grand Harbor in 2011. REUTERS/Darrin Zammit Lupi Potanin, who has since remarried, had been planning to give away "at least" half of his wealth prior to the divorce.

"I also see it as a way to protect my children from the burden of extreme wealth, which may deprive them of any motivation to achieve anything in life on their own," he said.