China on Friday slammed Japan over reported plans to ramp up defense spending and consider exceptions to its three non-nuclear principles, potentially allowing nuclear weapons to be brought into the country in an emergency.

Japan's revised security documents are also expected to continue describing China as its "greatest strategic challenge". 

Chinese Defense Ministry spokesperson Chen Xi said Japan's moves betray its commitment to peace and challenge the postwar international order. 

Chen called on the international community to stay vigilant and uphold the global nuclear non-proliferation regime.