Presidents (L-R) Sebastian Pinera of Chile, Enrique Pena Nieto of Mexico, Laura Chinchilla of Costa Rica, Ollanta Humala of Peru and Juan Manuel Santos of Colombia, arrive at an official photo session in the historic city of Cartagena Feb 10, 2014. Presidents of Colombia, Chile, Peru and Mexico are attending the 8th Pacific Alliance Summit in this Caribbean port. Costa Rica was granted full membership in the regional trading bloc on Monday. [Photo/Agencies]