Increasing Chinese military aggression and assertiveness in recent years has been alarming. For neighboring Japan, this is a matter of existential threat, pushing it to bolster its military capabilities and deepen its alliance with the US. Japan must rapidly fortify its islands and acquire offensive weapons. The specter of Chinese expansionism could also give Japan a role in regional security.
Japan is paranoid about China. More significantly, it is using China as an excuse for its own military expansion. Exaggerating the "China threat" and interfering in China's internal affairs, Japan is denying the peaceful nature of China's development policy and defensive military stance. It is likely to use China as a false flag to justify its own ambitions.