FILE - In this Dec. 5, 2014 file photo, UNASUR leaders pose for a group photo at the inauguration of the new UNASUR headquarters building in Quito, Ecuador. From left to right are Suriname's President Desi Bouterse, Brazil's President Dilma Rousseff, Argentina's President Cristina Fernandez, Ecuador's President Rafael Correa, Colombia's President Juan Manuel Santos, UNASUR General Secretary and former Colombian President Ernesto Samper, Venezuela's President Nicolas Maduro, and Bolivia's President Evo Morales. The South American regional bloc did attempt to mediate between the Venezuelan government and the opposition last year. But that effort fell through, and observers see those leaders as loath to try again. (AP Photo/Dolores Ochoa, File)
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