Visiting South Korean Foreign Minister Kang Kyung-wha met with Foreign Minister Taro Kono on Tuesday in Tokyo for a three-hour talk, discussing sensitive bilateral issues involving the 2015 landmark agreement on "comfort women," Japanese officials said.

Comfort women refer to those forced to work at Japanese military brothels before and during World War II. The meeting took place days before a task force under South Korean President Moon Jae-in is expected to reveal its report of a review the 2015 bilateral agreement, which Tokyo has long demanded Seoul maintain and quickly implement.

Under the 2015 deal, the countries agreed to settle all diplomatic issues involving the comfort women "finally and irreversibly," but speculation has been rife that the task force may urge Moon to revoke it or to try to re-open negotiations.