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(L-R) U.S. President Barack Obama and Russian President Dmitry Medvedev talk during the 2012 Seoul Nuclear Security Summit at the Hankuk University of Foreign Studies on March 26, 2012 in Seoul, South Korea. (Sasha Mordovets/Getty Images)

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A satellite image shows what CSIS Asia Maritime Transparency Initiative says appears to be concrete structures with retractable roofs on the artificial island Fiery Cross reefs in the South China Sea in this image taken February 7, 2017 and released on Fe

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Welcome and Opening Remarks from Commissioner Ajit Pai at the E-Rate Modernization Workshop, May 6, 2014. (FCC/Flickr/Released)

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U.S. President Donald Trump (R) and Japanese Prime Minister Shinzo Abe in the Oval Office at the White House February 10, 2017 in Washington, DC. (Chip Somodevilla/Getty Images)

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Pakistani devotees gather outside the shrine of 13th century Muslim Sufi saint Lal Shahbaz Qalandar a day after a bomb blew up at the shrine in the town of Sehwan in Sindh province, February 17, 2017. (ASIF HASSAN/AFP/Getty Images)

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(Rubberball/Mike Kemp/Getty Images)

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President Donald Trump speaks on the phone with Russian President Vladimir Putin in the Oval Office of the White House, January 28, 2017 in Washington, DC. (Drew Angerer/Getty Images)