Mikhail Fridman

The oligarchs behind Alfa-Access-Renova (AAR) include Fridman.At 47, he has an estimated wealth of $15.1bn, making him Russia's seventh richest man.

Fridman and Peter Aven founded the Alfa Group Consortium – a holding company which controls Alfa Bank, Alfa Capital, Tyumen Oil, several construction material firms and a supermarket chain.

Len Blavatnik

The multibillionaire recently agreed to pay $3.3bn for Warner Music via his industrial holding company Access Industries. Blavatnik is a major petrochemicals investor, but has occasionally bought media assets. Access has a controlling stake in Top Up TV, the pay-TV business.

Born in the Soviet Union in 1957, he emigrated with his family to the US in 1978. He lives in New York and London, where he has a home in Kensington Palace Gardens.

Viktor Vekselberg

Ukraine-born oil and metals baron Vekselberg is overseeing a turnaround at aluminium giant UC Rusal, which he formed with fellow billionaire, Oleg Deripaska. Made first million selling scrap copper from old cables. In the 1990s together with fellow billionaire Leonard Blavatnik bought aluminum smelters to form a company called Sual. Consummate dealmaker also has interests in chemicals, utilities and telecoms.

Owns Fabergé egg collection.

German Khan

A native of Kiev, graduated from the Moscow Institute of Steel and Alloys in 1988. The next year, with former classmate Fridman, co-founded Alfa-Eco, a commodities trader and predecessor of Alfa Group. Heads Alfa Group's oil business as executive director and board member of oil company TNK-BP. He enjoys hunting and has a large collection of sporting guns and rifles.