The breakthrough agreement on the comfort women issue between Japan and South Korea on Dec. 28, 2015, was the culmination of at least four years of negotiations between the two governments. South Korean President Park Geun-hye and Japanese Prime Minister Shinzo Abe pushed for the agreement; the Obama administration provided persistent pressure while resisting a mediation role. The danger of the agreement falling apart is apparent to officials in Washington and Seoul, and hopefully Tokyo too, writes Sneider.