"The first comfort women didn't actually come forward until 1992, and since then, the issue has really been kicked up. Japan issued a 1993 acknowledgement on this. It's called the Kono Agreement. But in recent years, South Korea has been wanting an apology to go much further."
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Source : "South Korea, Japan Reach Major Deal On Wartime Sex Slaves". "All Things Considered" with Audie Cornish, www.npr.org. December 28, 2015.