Japanese automakers Nissan and Honda have announced plans for a merger that would catapult them to a top position in an industry that's in flux as it transitions away from its reliance on fossil fuels.

Facing extreme competitive pressure from the rise of Chinese EV makers, the Nos. 2 and 3 Japanese automakers turn to each other to build strength.

Honda's shares went up by as much 17% when local markets opened on Tuesday.