Boris Berezovsky: Tycoon Under Siege

Russia's most notorious oligarch could become Vladimir Putin's biggest target

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.

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