FIGHTING WORDS: A bitter war of words broke out Tuesday between two of Russia's richest men after Viktor Vekselberg quit as chairman of Rusal, the world's largest aluminum producer.

OUT OF THE SHADOWS: The resignation marks an unusually public spat among the secretive ranks of Russia's corporate community and prompted a rebuke of Vekselberg's conduct as chairman by fellow billionaire Oleg Deripaska, who controls Rusal.

THE WAY OUT: Rusal, which is 47 percent owned by Deripaska's holding company noted that Vekselberg had failed to attend any board meetings since February 2011 and had missed the annual shareholder meeting in June.