Japan has gone ahead and decided that airspace above Yonaguni island, the westernmost island in all of Japan, is indeed entirely Japan’s responsibility. That may sound like a no-brainer, but during the 1950s, the United States controlled Yonguni and the rest of the Ryukyu islands and decided to split control of the airspace with Taiwan. Taiwan is not happy. On June 26, Japan unilaterally extended the ADIZ [Air Defense Identification Zone--JSW] line westwards by 22 kilometers. As a result, Taiwanese and Japanese AIDZs now overlap. That Tokyo seems willing to put up with the prospect of doing damage to Taiwan-Japan...