Their targets in SE Asia were primarily US and British. Pearl Harbor gets all the attention but they launched surprise attacks in the following days against the Phillipines, Guam, Midway, Wake Island, and Hong Kong. Not just one boom, it was boom boom boom boom boom. But I was just making the point that the Japanese were being "starved for oil" because they had already been at work creating their "empire" for some time before Pearl Harbor, and the oil embargo was the West's lame attempt at deterrence/suppression of that effort. Without that context the post above makes it sound like the Japanese were being deprived of oil for no reason but spite.