South Korea's Foreign Minister Kang Kyung-wha has spoken over the phone with her Japanese counterpart Taro Kono on the upcoming inter-Korean summit. Kono reaffirmed a commitment to peacefully resolve the DPRK nuclear issue, and promised to cooperate with relevant partners. The top diplomats discussed bilateral ties and details for Kono's visit. They also agreed to work together to hold a trilateral summit with leaders from South Korea, Japan, and China.