Russia's richest man has a deal to buy a controlling interest in the New Jersey Nets and nearly half of a project to build a new arena in Brooklyn. Mikhail Prokhorov's Onexim Group announced the deal Wednesday with Forest City Ratner Companies and Nets Sports and Entertainment. They say they have signed a letter of intent to create a strategic partnership for the development of the Atlantic Yards Project. NBA Commissioner David Stern is praising the move.