U.S. Secretary of State Rex Tillerson (R) speaks during a joint press conference with Japanese Defense Minister Itsunori Onodera (L) and Foreign Minister Taro Kono 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)
