Russian Helicopters was valued at as much as $2.38 billion before an initial public offering in London as the company seeks funds to pay off debt and buy shares in its units. The division of state-owned defense industry holding company Oboronprom is seeking $19 to $25 per Global Depositary Receipt, valuing it at $1.81 billion to $2.38 billion, according to a statement Tuesday. Russian Helicopters aims to raise […]