Japanese Military movements

Yonguni Island probably doesn’t mean much to anyone except divers and archealogists. Yonaguni Island is home to an interesting collection of what some describe as the oldest buildings in the world. They aren’t actually on the island, they are in the water and are a major attraction for visitors.
Situated less than a hundred miles from Taiwan, Yonguni is the southern most Island of Japan and part of the Okinawa Perfecture District. It is making some news lately with the reported movement of Japanese Defence Forces possibly being relocated there. It is possible that Japan is trying to show its resolve in protecting its southern border from any intrusion, although this hasn’t been a problem in the past. There are a number of reasons that Japan may be moving troops to this location besides a show of force. Over the past 15 years Japan has started to come out of its cacoon which it wrapped itself in after their defeat in the Second World War. In recent years the Japanes Defence Forces have served in locations outside their national bounderies which was previously prohibited by the Constitution. Japan is once again taking a larger military role in world affairs. This move to Yonguni Island may be one method of getting the people of Japan use to the idea of military use in unison with diplomatic ends.
Japan also has Islands in the north which have been occupied by Russia since the end of the Second World War. Is it possible they are flexing their muscle in the south before stretching to the north?