(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Heads of State and Government pose for a family picture during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Heads of State and Government pose for a family picture during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- U.S. President Donald Trump (L) speaks with British Prime Minister Theresa May during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Leaders observe a helicopter flypast during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Canadian Prime Minister Justin Trudeau arrives at a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Canadian Prime Minister Justin Trudeau (C) arrives at a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Iceland's Prime Minister Katrin Jakobsdottir speaks to media as she arrives at a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan) (rh)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Iceland's Prime Minister Katrin Jakobsdottir arrives at a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan) (rh)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- U.S. President Donald Trump (back) speaks with Luxembourg Prime Minister Xavier Bettel during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Leaders observe a helicopter flypast during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- NATO Secretary General Jens Stoltenberg (center L) shakes hands with U.S. President Donald Trump during a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- Norway's Prime Minister Erna Solberg (front) arrives at a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more(180711) -- BRUSSELS, July 11, 2018 (Xinhua) -- NATO Secretary General Jens Stoltenberg speaks to media prior to a NATO summit in Brussels, Belgium, July 11, 2018. NATO leaders gather in Brussels for a two-day meeting. (Xinhua/Ye Pingfan)(yg)more