China's Foreign Ministry on Friday strongly criticized Japan after a Self-Defense Forces (SDF) vessel transited the Taiwan Strait, warning that the Taiwan question is a "red line" that must not be crossed. China's Foreign Ministry on Friday strongly criticized Japan after a Self-Defense Forces (SDF) vessel transited the Taiwan Strait, warning that the Taiwan question is a "red line" that must not be crossed. Foreign Ministry spokesperson Guo Jiakun mad... [2189 chars]