Foreign Policy

U.S. President Barack Obama speaks during a news conference with British Prime Minister David Cameron in the East Room of the White House January 16, 2015 in Washington, DC. The two leaders had an Oval Office meeting earlier discussing bilateral issues including economic growth, international trade, cyber security, Iran, ISIL, counterterrorism, Ebola, and Russia's actions in Ukraine. (Photo by Mark Wilson/Getty Images)

Indian Prime Minister Narendra Modi (R) and US President Barack Obama walk prior to meetings at Hyderabad House in New Delhi, India, January 25, 2015. (SAUL LOEB/AFP/Getty Images)

(ALEXANDER ZEMLIANICHENKO/AFP/Getty Images)

Indian Prime Minister Narendra Modi and US President Barack Obama shake hands during the India-US Business Summit in New Delhi on January 26, 2015. (SAUL LOEB/AFP/Getty Images)

(Department of Defense)

Iranian Foreign Minister Mohammad Javad Zarif (R) shakes hands on January 14, 2015 with US State Secretary John Kerry in Geneva. (RICK WILKING/AFP/Getty Images)