Takashi Tomitori, an amateur diver who is also an auto mechanic, at work on the island of Yonaguni, Japan, on Dec. 11, 2025. Tomitori says he is worried about stationing missiles on the island. (Ko Sasaki/The New York Times) By Javier C. Hernández and Hisako Ueno As a lifelong resident of Yonaguni, a remote island that is Japan’s westernmost point, Himeyo Ukemasu remembers the distant days when life was measured by the bright stars, the tides and the ripening of mulberry trees. Today, the...