Rusal board chairman quits as part of U.S. sanctions waiver deal

MOSCOW (Reuters) - Russian aluminium company Rusal said on Wednesday that board chairman Matthias Warnig resigned as part of a restructuring it agreed to implement in exchange for a waiver from U.S. sanctions.The U.S. Treasury said last week it would remove sanctions against Rusal, its parent En+ and power firm EuroSibEnergo if they restructured to reduce the controlling stakes of businessman Oleg Deripaska, who is on Washington's sanctions list.Warnig stepping down after six years at the..