Oleg Boyko made his fortune in the manic shift to capitalism in Russia in the 1990s, investing in the nascent banking sector after the fall of communism. He founded an investment firm and made lucrative bets on the retail and gambling sectors and the steelmaking industry. He is tipped by Forbes to be worth $1.9 billion and has dipped his toes into Hollywood with investments in movie productions. He also wants $5 million back from an Irish-registered company. Boyko leads Finstar, an investment group with $2 billion in assets under management. In August of last year, an arbitrator in London…