TOKYO - In a sign of deepening popular and political animosity between China and Japan, Tokyo took formal possession this week of a tiny archipelago in the Pacific waters south of Japan. In the early morning of Feb. 9, Tokyo informed Beijing's embassy here that the Senkaku Islands would be administered by the Japanese coast guard. The unexpectedly bold action by Tokyo received little attention here. But it is seen as a "serious chess move," says one diplomat, in a region where power relations are being redefined, and where tensions over energy, borders, military buildups, and ethnic rivalries are palpable....