Japan did. The Vichy Indochina (French) gov't signed a treaty with Japan on 22-Sep-40 which pretty much ceded all military power to the Japanese. The Japanese immediately took steps that exceeded the treaty's provisions, and there was some resistance for a few days, but from 26-Sep-40 until the end of the war, the Japanese were in total control.
During WW2 Vietnam was a French protectorate and was named French Indochina.
France ruled it, and this is why it was called "French" Indochina.
India, Burma, French Indochina, Malaysia, and Indonesia were a few of them
The French had fought there from 1946 to 1954; 1st Indochina War or French Indochina War.
Invasion of French Indochina happened on 1940-09-26.
The French and the Japanese
Second French Indochina Campaign happened on 26-03-09.
France was the only European Nation fighting in the 1st Indochina War (also known as the French Indochina War or French War).
Only as men of the French Foreign Legion during the French Indochina War 1946-1954.
The French Indochina War 1946-1954 (aka 1st Indochina War).
French Indochina War or 1st Indochina War.
The Vietnamese