US President Donald Trump gives a thumbs-up as he walks to Marine One at General Mitchell International Airport in Milwaukee, Wisconsin, April 18, 2017. (SAUL LOEB/AFP/Getty Images)
Russia's president Vladimir Putin during a meeting with his envoy to the Volga Federal District, Alexander Yevstifeyev (not in picture) in the Kremlin. (Mikhail Klimentyev\TASS via Getty Images)
US President Donald Trump delivers a statement on Syria from the Mar-a-Lago estate in West Palm Beach, Florida, on April 6, 2017. (JIM WATSON/AFP/Getty Images)
US Secretary of State Rex Tillerson makes an opening speech during the Ministers of the global coalition on the defeat of Daesh, in Washington, United States on March 22, 2017. (Cem Ozdel/Anadolu Agency/Getty Images)
The Nimitz-class aircraft carrier USS Ronald Reagan (CVN 76) leads a mass formation of ships through the Pacific Ocean July 24, 2010, during Rim of the Pacific (RIMPAC) 2010. (Mass Communication Specialist 1st Class Scott Taylor, U.S. Navy/Released)
The launch of four ballistic missiles by the Korean People's Army (KPA) during a military drill at an undisclosed location in North Korea, March 7, 2017. (KCNA/STR/AFP/Getty Images)