Japan is the only Asian country never colonized by any of the Western powers. Japan itself started to build up a colonial empire at the end of the 19th century.
The Japanese colonial empire extended in East Asia and the Western Pacific. Some of the Japanese colonies included the Kurile Islands, Taiwan and Korea. The Japanese avoided foreign intrusion and only allowed the Chinese and the Dutch to have trading depots on their territory for years. They chose to limit Western trade as much as possible as they were aware of the implications foreign trade had on other Asian countries such as China.