Boris Berezovsky: Tycoon Under Siege

For more than a year, federal prosecutor Nikolai Volkov has been trying to prove whether large sums of money were stolen from Aeroflot, Russia's national airline. A prime suspect: Boris Berezovsky, the country's most notorious oligarch, who at one time counted Aeroflot among his far-flung business interests.

The fruits of Volkov's labor are displayed on a large diagram taped to the wall behind his desk. It's a jumble of arrows and boxes that looks like a map of the human genome. In fact, it's a sketch of how Aeroflot funds were allegedly routed through a network of companies in countries including Belgium, Cyprus, Germany, Lithuania, Panama, Syria, and Switzerland. Swiss prosecutors are also investigating Aeroflot and sharing information with Volkov. They will soon send him new documents that he believes will make or break a case against Berezovsky on embezzlement.