FILE PHOTO - Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89) transits in formation with Japan Maritime Self-Defense Force ships JS Kirisame (DD 104) and JS Asayuki (DD 132) during bilateral training in South China Sea on April 21, 2015. Courtesy David Flewellyn/U.S. Navy/Handout via REUTERS

French President Francois Hollande attends news conference after the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

A woman holds her smart phone, which displays the Google home page, in this picture illustration taken February 24, 2016. REUTERS/Eric Gaillard/Illustration/File Photo

School children hold candles and placards during a vigil for the soldiers who were killed after gunmen attacked an Indian army base in Kashmir's Uri on Sunday, in Agartala, India, September 19, 2016. REUTERS/Jayanta Dey

Syrian refugee children play at Azraq refugee camp for Syrians displaced by conflict, near Al Azraq city, Jordan, September 9, 2016. REUTERS/Muhammad Hamed

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, September 7, 2016. REUTERS/Staff/Remote

A United Parcel Service (UPS) truck on delivery is pictured in downtown Los Angeles, California October 29, 2014. REUTERS/Mike Blake

People speak together near a logo of Airbus Group during the Airbus annual news conference in Colomiers, near Toulouse, January 13, 2015. REUTERS/Regis Duvignau/File Picture