U.S. Defense Secretary James Mattis answers questions during a press conference with his Japanese counterpart Tomomi Inada (not in the picture) in Tokyo, Japan, Feb.4, 2017. (Xinhua/Ma Ping)
U.S. Defense Secretary James Mattis answers questions during a press conference with his Japanese counterpart Tomomi Inada (not in the picture) in Tokyo, Japan, Feb.4, 2017. (Xinhua/Ma Ping)