Short answers, pulled from the story.
Japan invaded the Dutch East Indies to secure oil resources because it lacked native sources and could not produce enough to meet even 10% of its needs. The colony produced 5,139 kilotons of petroleum in 1935, making it the fourth-largest exporter behind only the United States, Iran, and Romania.
The Netherlands declared war on Japan on the 8th of December 1941 following a public proclamation by the governor general. The declaration was handed to Japanese foreign minister Shigenori Tōgō by ambassador J. C. Pabst on the morning of the 10th of December after instructions were telegraphed to Tokyo at 02:30.
General Hisaichi Terauchi commanded the Southern Expeditionary Army Group which began the campaign against the Dutch East Indies. He sent the 16th Army under General Hitoshi Imamura to attack Borneo while other forces advanced toward Celebes, Amboina, and Timor.
The American-British-Dutch-Australian Command activated on the 15th of January 1942 under British field marshal Sir Archibald Wavell but dissolved on the 1st of March less than two months after its inception. Most Allied naval components were crushed in battles of Java Sea, Sunda Strait, and Second Java Sea before the command ended.
The Dutch surrendered without condition to Japan on the 8th of March 1942 at Kalijati Airfield in Subang, West Java during an event known as the Kalijati treaty. Lieutenant General Hein ter Poorten and Governor General Jonkheer A.W.L. Tjarda van Starkenborgh Stachouwer surrendered along with their forces on that date.