U.S. Secretary of Defense James Mattis (L) attends a joint press conference with Norwegian Minister of Defence Frank Bakke-Jensen in Oslo, Norway, July 14, 2018. Norway on Saturday reconfirmed its commitment to gradually increase defense spending to two percent of GDP in the North Atlantic Treaty Organization (NATO) during a visit by U.S. Secretary of Defense James Mattis to the Nordic country. (Xinhua/Liang Youchang)