South Korean President Moon Jae-in on Thursday met with nine women who were forced to work in Japanese wartime brothels, days after their plight again cast a shadow over relations with Japan.

A South Korean panel set up to investigate a 2015 agreement with Japan on the thousands of girls and women forced to provide sex for Japanese troops before and during World War II, euphemistically termed "comfort women" by Japan, has said the deal failed to meet their needs.

Moon said the 2015 deal, under which Japan apologized to victims and provided ¥1 billion ($8.8 million) to a fund to help them, was seriously flawed. Japan has said any attempt to revise it could damage relations.