France planned to join its Far East force to the Royal Navy

What was France's prewar plan for Japanese aggression in the Far East?

French ships would attach themselves to the stronger British fleet, contributing a fast wing rather than trying to defeat Japan independently.

The Japanese fleet was much stronger than the French fleet through most of the 1920s and 1930s. French rebuilding was not expected to change that balance substantially until well into the 1940s. France therefore planned to send forces to join the British, its major ally, which would have the larger fleet in the Far East. French ships would supply a fast wing for that combined force.