NEW : Kerry says North Korea , U.S. ready to work with North Korea to resolve tensions . Kerry 's visit to Japan is the last stop in his Asia tour . North Korea tells Tokyo to `` stop recklessly working for staging a comeback on `` China is firmly committed to upholding peace and stability and advancing the denuclearization process on the peninsula , '' Yang said . Japan '' Kerry : U.S. and the Japan call on Korea to refrain from provocative steps .
NEW : Kerry says North Korea , U.S. ready to work with North Korea to resolve tensions . Kerry 's visit to Japan is the last stop in his Asia tour . North Korea tells Tokyo to `` stop recklessly working for staging a comeback on Japan '' Kerry : U.S. and the Japan call on Korea to refrain from provocative steps .