Japan has relied too heavily on the U.S. for security, according to Taro Kono, Japan's former defense minister, as concerns grow that Washington may scale back its global military role. "I think we have put too much burden on the United States," Kono, who also previously served as foreign minister, told CNBC's Emily Tan on " The China Connection ." 'Now, Japan, Korea, Australia, the Philippines, Singapore — we need to shoulder more burden on our shoulders to keep the peace and stability in the