On June 20, 1940, the French government succumbed to the Japanese government¡¯s demands, suddenly closed the Vietnam Railway and banned the import of goods into China. After the fall of Guangzhou Wuhan, the Vietnam Railway was the only route for China¡¯s foreign communications, and China¡¯s international aid mostly relied on this route to China, and its strategic position was very important. The Japanese government, in order to fight the Chongqing National Government, repeatedly suppressed the French government¡¯s closure of the route. On June 17, the Japanese government¡¯s desire to close the Vietnam Railway was finally realized on June 20. After the French closure of the Vietnam Railway, the French Ministry of Foreign Affairs on June 21, 24, twice raised a serious protest against the French Embassy in China, claiming