U.S. Secretary of State Rex Tillerson (R) and Japanese Foreign Minister Taro Kono arrive for a joint press conference at the State Department in Washington D.C., the United States, on Aug. 17, 2017. U.S. Secretary of State Rex Tillerson reaffirmed on Thursday that diplomatic effort was "first and foremost" choice in solving the Korean Peninsula nuclear issue. (Xinhua/Yin Bogu)
