The South Korean ambassador to Japan slammed Toru Hashimoto on Wednesday for his remarks justifying Japan's wartime sex slave system, saying the Osaka mayor lacked historical knowledge and regard for the rights of women.

"I'm disappointed to know that a Japanese politician has such a poor understanding of history and women's human rights," Shin Kak Soo said at a press conference at the Japan National Press Club in Tokyo.

However, the ambassador expressed relief that Japanese citizens were critical of Hashimoto for his comments.