仏印進駐
Prince Cường Để lived in Taiwan from 1939 to May 1940, where he produced a daily four-hour radio show. Later that year, the Japanese invasion of French Indochina occurred, but left the Vichy French colonial administration intact in order to maintain stable conditions to obtain essential war materials. However, Prince Cường Để remained loyal to the concept of the Greater East Asia Co-Prosperity Sphere and made contact with leaders of the Cao Đài movement who were interested in a monarchy led by Prince Cường Để. Following the collapse of the Vichy French government, the Japanese staged a coup de main, creating the independent Empire of Vietnam. Prince Cường Để brought forth a five-member provisional government, which was sponsored by the IJA 38th Army; however, Tokyo made the surprising decision to retain Emperor Bảo Đại as nominal head of state, and Prince Cường Để's efforts to return as ruler of Vietnam were frustrated.