How did China respond to Japan's recognition of Taiwan in family registries?

China responded firmly to Japan's policy change by urging them to abide by the One China principle, which views Taiwan as an inseparable part of Chinese territory. The Chinese Foreign Ministry spokesperson specifically warned Japan against employing what they termed as 'gimmicks' regarding the Taiwan question. Beijing also cautioned Japan to avoid sending any conflicting or wrong signals that might undermine the One China policy, which has been the foundation of diplomatic relations between China and other nations. This response highlights the ongoing tensions in the region and China's consistent stance on Taiwan-related matters in international relations.