US President Barack Obama, Cuban President Raul Castro, in Panama City on April 11, 2015. 美國總統歐巴馬, 古巴總統勞爾‧卡斯楚, 巴拿馬市

President Obama and Cuban President Raul Castro at the Summit of the Americas in Panama City on April 11, 2015. (Pablo Martinez Monsivais/AP)
American food producers see bonanza in Cuba, but steep barriers remain - The Washington Post
https://www.washingtonpost.com/world/national-security/american-food-producers-see-bonanza-in-cuba-but-steep-barriers-remain/2015/06/18/1e9f0d5a-1502-11e5-89f3-61410da94eb1_story.html

 Barack Obama and Cuban president Raul Castro met in Panama in 2015. The year before, they announced their countries would begin normalizing relations. Photograph: Pablo Martinez Monsivais/AP
Barack Obama to make historic trip to Cuba in coming weeks | World news | The Guardian
http://www.theguardian.com/world/2016/feb/17/barack-obama-cuba-visit-raul-castro-foreign-policy