The Japanese invasion and subsequent occupation during World War II interrupted Dutch rule and encouraged the previously suppressed Indonesian independence movement. In May 1940, early in World War II, Nazi Germany occupied the Netherlands, but the Dutch government-in-exile initially continued to control the Dutch East Indies from its base in London. The Dutch East Indies declared a state of siege and in July 1940 redirected exports intended for Japan to the US and Britain. Negotiations with the Japanese aimed at securing supplies of aviation fuel collapsed in June 1941, and the Japanese started their conquest of Southeast Asia in December of that year. That same month, factions from Sumatra sought Japanese assistance for a revolt against the Dutch wartime government. The Japanese military defeated last Dutch forces in the East Indies in March 1942.