China urged Japan on Wednesday to deeply reflect on its history of aggression, the suffering it has inflicted on others, properly handle the issue of "comfort women", and other issues left over from history with an honest and responsible attitude.

The United Nations Working Group on Discrimination against Women and Girls and other special procedures sent a letter to Japan expressing serious concerns over Japan's effort to deprive the victims of its "comfort women" system of their rights to seek truth and compensation.

China and other countries provided supporting materials and comments as required by the special procedures.

Certain forces in Japan have long been attempting to deny or even tamper with the history of the forced recruitment of "comfort women", Foreign Ministry spokesman Lin Jian said.

China has serious concerns over Japan's dishonest attitude and erroneous practice toward its history of aggression, he told a daily news conference.

The forced recruitment of "comfort women" is a serious crime committed by Japanese militarism, which severely trampled on the rights of the victims, Lin said.

"The evidence of the crime is ironclad and undeniable," Lin said, adding that there is a strong outrage in the international community over the crime.

Japan should earn trust from its Asian neighbors and the world with concrete actions, he added.