Short answers, pulled from the story.
Japan invaded the Dutch East Indies to secure oil it could not produce at home, where domestic output could not meet even 10% of Japan's needs. President Roosevelt's executive order of the 26th of July 1941 froze Japan's American assets and ended oil exports, wiping out 93% of Japan's supply. The East Indies, the world's fourth-largest oil exporter, were the only viable alternative.
The Dutch surrendered to Japan without condition on the 8th of March 1942 at Kalijati Airfield in Subang, West Java. The following day, Lieutenant General Hein ter Poorten and Governor General Jonkheer A.W.L. Tjarda van Starkenborgh Stachouwer formally completed the surrender. The event is also known as the Kalijati treaty.
ABDACOM, the American-British-Dutch-Australian Command, was a multinational coalition activated on the 15th of January 1942 to coordinate Allied defense of the Dutch East Indies. British field marshal Sir Archibald Wavell commanded it overall. Admiral Conrad Helfrich dissolved ABDACOM on the 1st of March 1942, less than two months after its formation, as the Allied position collapsed.
Announcer Bert Garthoff closed NIROM's broadcasts on the 8th of March 1942 with the words: 'Listeners, we're closing now. Farewell, until better days. Long live the Fatherland, long live the Queen.' When Japanese authorities ordered the station to carry on as usual, employees signed off each broadcast with the Dutch National Anthem. Japanese officials subsequently executed three NIROM employees in retaliation.
Japan's military planners calculated that seizing the Dutch East Indies would bring the United States into the war. To prevent this, they chose to neutralize the American Pacific Fleet first. That calculation led directly to the attack on Pearl Harbor.
Most Japanese military personnel and civilian administrators were repatriated to Japan after World War II, and several hundred were detained for war crimes investigations. About 1,000 Japanese soldiers deserted rather than return home and assimilated into local communities across the former Dutch colony. Many of them later provided assistance to Indonesian Republican forces during the Indonesian National Revolution.