With China's ambitious military expansion and intimidation actions in the Pacific, the situation in the Indo-Pacific region has become increasingly volatile, and the most critical area is Taiwan. A Taiwan contingency is no longer limited to the Taiwan Strait, and Japan is on the front line. How does the Japan-U.S. alliance evaluate China's new strategy for Taiwan's ambitions and capabilities? With a stronger and committed PRC military, and a overextended and weakened U.S., how prepared is Japan prepared for a Taiwan contingency? What are the Japanese society's opinions on the issue? And furthermore, is the U.S.-Japan alliance reliable enough?