A farmer stands near a field in South Hwanghae, North Korea. Wong Maye-E/AP hide caption

itoggle caption Wong Maye-E/AP

Shoppers make their way in a Tehran bazaar. Once international sanctions are lifted, $100 billion from Iranian oil sales will be released from escrow accounts. Vahid Salemi/AP hide caption

itoggle caption Vahid Salemi/AP

President Barack Obama walks with Brazilian President Dilma Rousseff, second from right, during a visit to the Martin Luther King Jr. Memorial in Washington, D.C., on Monday. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

U.S. Defense Secretary Ash Carter, right, and Vietnam's Defense Minister Phung Quang Thanh review the guard of honour during a welcoming ceremony at the Defense Ministry in Hanoi, Vietnam, on June 1. The U.S., Russia, France, the U.K. and other countries are all jockeying to sell military equipment to Southeast Asian countries. Hoang Dinh Nam/Reuters/Landov hide caption

itoggle caption Hoang Dinh Nam/Reuters/Landov

The Polar Star completes ice drills in the Arctic in July 2013. Built in the 1970s and only meant to last 30 years, the vessel is the U.S. Coast Guard's only heavy icebreaker. U.S. Coast Guard/Reuters/Landov hide caption

itoggle caption U.S. Coast Guard/Reuters/Landov