Two Russian billionaires clash on management at the world 's largest oil company , . Alexander Vekselberg said Rusal was in ` ` deep crisis '' because of bad management . Igor Deripaska , Rusal 's chief executive , said ' there is no . '
Two Russian billionaires clash on governance at the world 's largest aluminium company , . Viktor Vekselberg said Rusal was in `` deep crisis '' because of bad management . Oleg Deripaska , Rusal 's chief executive , said 'there is no crisis '