Tokyo should officially recognize the women Japan forced into sexual slavery for the Imperial army in the 1930s and '40s and formally apologize, a South Korean former "comfort woman" demanded Wednesday.

"I have had it with the Japanese government's shrewd ways," Lee Yong Soo said, speaking on a panel with opposition lawmakers who have a bill before the House of Councilors on the wartime sex slave issue.

Lee, 78, was one of the three women who testified for the first time before the U.S. House of Representatives Foreign Affairs Subcommittee on Asia in Washington last week, as they debated a bipartisan resolution denouncing Japan for having used "comfort women," the term of the day for the enslaved women.