Nissan Motor Co. CEO Carlos Ghosn announced Thursday he will become chairman of Mitsubishi Motors Corp., vowing to help reform the struggling automaker.

The news adds yet another leadership title to Ghosn's resume alongside posts at Nissan and its major stakeholder Renault of France. He also said Mitsubishi's current chairman and CEO, Osamu Masuko, will stay on as CEO.

"I speak for all of us when I say we will give our absolute commitment to support Mitsubishi Motors," Ghosn said during a hastily arranged joint news conference with Mitsubishi in Tokyo. He will officially become Mitsubishi's chairman after a shareholders meeting later this year.