Relations between China and Japan — never smooth, given the legacy of Japan's invasion of China in the 1930s — are currently at their tensest in years. This follows the new Japanese Prime Minister Sanae Takaichi's remarks in Japan's parliament last month that if China were to use military force against Taiwan — which Beijing claims as part of its territory — Japan would view this as a threat to its survival, and could deploy its own military in response. China has denounced Ms Takaichi's comm...