Japan on Wednesday rejected a South Korean government report that raised doubts over the process that led to a bilateral deal aimed at resolving a dispute over Korean women who were forced to work in Japan's wartime military brothels.

"We see no problem in the process leading to the accord, which followed a legitimate negotiation process between the two governments," Foreign Minister Taro Kono said in a statement, adding that seeking to change the 2015 deal is "totally unacceptable."

Kono added that Tokyo "strongly demands" that Seoul steadily implement the deal, which the two countries confirmed at the time would resolve "finally and irreversibly" the comfort women issue.