The 15 richest Russian people in the world, ranked

Estimated net worth: $7.6 billion (£5.8 billion)

Age: 51

Mikhail Prokhorov's fortune comes from being the owner of the National Basketball Association team the Brooklyn Nets and the Barclays Centre, the team's home in New York City, as well as his investment in the nickel corporation Norilsk Nickel. The businessman is also known for his unsuccessful run against Vladimir Putin in Russia's 2012 presidential election.

Estimated net worth: $7.6 billion (£5.8 billion)

Age: 49

Another affluent sports enthusiast, the famous oligarch Roman Abramovich earns his wealth from investments in companies including the steel and mining business Evraz, nickel manufacturer Norilsk Nickel, and Chelsea Football Club, which he owns.

Estimated net worth: $7.7 billion (£5.9 billion)

Age: 69

Billionaire Dmitry Rybolovlev is a trained doctor who got rich after starting an investment fund and becoming board chairman of the Russian potassium fertiliser company Uralkali in 1995. Now living in Monaco, Rybolovlev has a majority stake in the football club AS Monaco.

Estimated net worth: $8.2 billion (£6.2 billion)

Age: 44

Self-made billionaire Andrey Melnichenko made his wealth from MDM Bank, which he co-founded out of a series of currency exchange booths he established. He also owns stakes in the fertiliser business Eurochem, coal company SUEK, and power firm SGK.

Estimated net worth: $8.7 billion (£6.6 billion)

Age: 54

Businessman German Khan owes his fortune to his shares in the financial and industrial investment giant Alfa Group. Previously, he was the executive director of the former oil company TNK-BP, which also added to his wealth.

Estimated net worth: $8.9 billion (£6.7 billion)

Age: 65

Oil magnate Vagit Alekperov's wealth derives from his position as CEO of Russia's biggest oil company, Lukoil.

Estimated net worth: $9.3 billion (£7.1 billion)

Age: 60

A former mechanic and steel-worker, Vladimir Lisin wound up a self-made billionaire with a majority stake in Novolipetsk, a steel mill that has become Russia's biggest source of the metal.

Estimated net worth: $10.5 billion (£8 billion)

Age: 59

Ukranian-born Viktor Vekselberg earned much of his fortune from selling his 50% stake in the oil company TNK-BP. He currently holds investments in Schmolz+Bickenbach, a Swiss steel firm, and Octo Telematic, an Italian software company, the Bank of Cyprus, and more.

Estimated net worth: $10.9 billion (£8.3 billion)

Age: 50

Born to mill worker parents, Alexey Mordashov's self-made billions derive from his steel firm Severstal, where he was CEO for 19 years; though he resigned in 2015, he is still the company's majority shareholder.

Estimated net worth: $11.4 billion (£8.7 billion)

Age: 63

Gennady Timchenko is an oil and gas tycoon based in Geneva. His wealth derives from the energy trading giant Guvnor Group, which he co-founded with business partner Torbjorn Tornqvist, to whom he sold his stake in the company in 2014.

Estimated net worth: $12.1 billion (£9.2 billion)

Age: 55

Moscow-born oligarch Vladimir Potanin has made his billions through his metals company Norilsk Nickel, of which he is chairman and a key shareholder, and the conglomerate Interros, which he founded in 1990. He has also signed Bill Gates' and Warren Bufet's Giving Pledge, promising to give at least half of his wealth to charity.

Estimated net worth: $12.5 billion (£9.5 billion)

Age: 62

Named one of the world's most powerful people by Forbes in 2015, self-made billionaire Alisher Usmanov has earned his fortune from investment in several companies including iron and steel firm Metalloinvest, mobile phone company MegaFon, politics and business newspaper Kommersant, and Arsenal Football Club.

Estimated net worth: $13.3 billion (£10.1 billion)

Age: 52

London-based billionaire Mikhail Fridman derived his wealth from his share of the investment company Alfa Group, which encompasses Russia's largest private financial institution Alfa Bank. The tycoon recently announced his plans to donate his fortune to charity.

Estimated net worth: $14.4 billion (£10.9 billion)

Age: 60

In addition to being the wealthiest man in Russia, Leonid Mikhelson is the 60th richest billionaire in the world. The Moscow-based entrepreneur's wealth comes from his gas and petrochemical company Sibur, and the natural gas firm Novatek, of which he is CEO and a major shareholder.