Kim Ahn : Apparent breakthrough on N. Korean nukes comes at critical time . She says Obama administration sees regime not likely to happen . Ahn : China 's sway could grow with food crisis ; and there are signs that U.S. influence waning . Ahn : Still , North Korea wants China to lift its sanctions and to formally end Korean War .
Christine Ahn : Apparent breakthrough on N. Korean nukes comes at critical moment . She says Obama administration sees regime not likely to collapse . Ahn : China 's sway could grow with food aid ; and there are signs that U.S. influence waning . Ahn : Still , North Korea needs U.S. to lift its sanctions and to formally end Korean War .