Drone surveillance and warfare

Iranian Foreign Minister Mohammad Javad Zarif, left, and Japanese Prime Minister Shinzo Abe, right, speak at Abe's official residence in Tokyo Thursday, May 16, 2019. Iran’s foreign minister has said his country is committed to an international nuclear deal and criticized escalating U.S. sanctions “unacceptable” as he met with Japanese officials in Tokyo amid rising tensions in the Middle East.(AP Photo/Eugene Hoshiko, Pool)

People inspect the site of an airstrike by Saudi-led coalition in Sanaa, Yemen, Thursday, May, 16, 2019. Yemen's human rights minister says heavy fighting is underway in the country's south as rebel Houthis push to gain more territory from government forces and their allies. The clashes come as the Saudi-led coalition carried out airstrikes on the capital, Sanaa, earlier on Thursday, targeting the Houthis and killing at least three civilians. (AP Photo/Hani Mohammed)

In this undated photograph obtained by The Associated Press, a UAV-X drone flown by Yemen's Houthi rebels is seen in Hodeida, Yemen. A Yemen rebel drone strike this week, likely by UAV-Xs, on a critical Saudi oil pipeline shows that the otherwise-peaceful sandy reaches of the Arabian Peninsula now are at risk of similar assault, including an under-construction nuclear power plant and Dubai International Airport, among the world's busiest. (AP Photo)

In this Thursday, May 9, 2019 photo released by the U.S. Navy, the Nimitz-class aircraft carrier USS Abraham Lincoln transits the Suez Canal in Egypt. The aircraft carrier and its strike group are deploying to the Persian Gulf on orders from the White House to respond to an unspecified threat from Iran. (Mass Communication Specialist Seaman Dan Snow, U.S. Navy via AP)

In this photo taken in March 2006 and made available by the Ministerio de Defensa de Espana, sailors stand on board the Mendez Nunez Spanish frigate, in Ferrol, Spain. Spain has temporarily pulled out the frigate that was part of a United States-led combat fleet from waters near the Persian Gulf, where tension is mounting between the US and Iran. (Ministerio de Defensa de Espana, via AP)

This satellite image provided by Maxar Technologies shows the Saudi-flagged oil tanker Amjad off the coast of Fujairah, United Arab Emirates, Monday, May 13, 2019. As many as four oil tankers anchored in the Mideast were damaged in what Gulf officials described Monday as a "sabotage" attack off the coast of the United Arab Emirates. (Satellite image ©2019 Maxar Technologies via AP)

This undated photo provided by the Nashville Police Department shows Daniel Everette Hale. The former government intelligence analyst has been charged with leaking classified documents about military campaigns against terrorist group al-Qaeda to a reporter. Hale, 31, of Nashville, Tenn., was arrested Thursday morning, May 9, 2019. (Nashville Police Department via AP)

FILE - This Jan. 18, 2015, file photo shows a sign at the entrance to Camp Amache, the site of a former World War II-era Japanese-American internment camp in Granada, Colo. A University of Denver team is using a drone to create a 3D reconstruction of the camp in southern Colorado. The Amache effort is part of a growing movement to identify and preserve historical sites connected to people of color in the U.S. (AP Photo/Russell Contreras, File)

FILE - In this March 2, 2019 file photo, Yellow Vests protesters march on the Champs Elysees avenue in Paris. France's yellow vest protesters remain a force to be reckoned with five months after their movement started, and as President Emmanuel Macron announces his responses to their grievances. It includes people across political, regional, social and generational divides angry at economic injustice and the way President Emmanuel Macron is running France. (AP Photo/Kamil Zihnioglu, File)