Wall Street Journal | Planned $4 Billion Japan Oil Merger Faces Family Challenge Wall Street Journal TOKYO—Saudi Arabia and Iran's battle for hegemony in the Middle East threatens to upend a $4 billion merger in faraway Japan. The family of the late founder of Idemitsu Kosan Co. is opposing a planned merger between the refiner—Japan's second-largest ... Japan oil family descendants put merger on slippery slope |