However, in Japan, since the social security had declined when the Kamakura bakufu was ruined and the Imperial Court was divided, the piracy by wako (Japanese Pirates) was rampant and the trade with China didn't carry on smoothly because of the social security worsening and public administration stagnating.
しかし日本では鎌倉幕府が滅び朝廷が分裂する中で治安が悪化、倭寇が出没するようになり貿易船を襲うなど海賊行為が横行し、社会不安や行政機能の停滞などもあって、貿易は円滑なものとはいえなかった。