beijing chinese premier li keqiang call tuesday advance free trade agreement talk china japan south korea state news agency xinhua report provide detail china seek get relations japan south korea back track dispute rein north korea nuclear missile program japan case two countries sensitive wartime history china stand ready work relevant party speed negotiations china-japan-south korea fta li tell regional summit manila xinhua say three countries begin free trade agreement talk november 2012 late round talk hold tokyo april report add china call advance free trade talk south korea japan