Mexican President Enrique Pena Nieto (L), and the Panama's President Ricardo Martinelli (C), review the honor guard during a welcoming ceremony in the National Palace, in Mexico City, capital of Mexico, on March 24, 2014. Ricardo Martinelli is on an official visit to Mexico. (Xinhua/Alejandro Ayala)

Mexican President Enrique Pena Nieto (R), and the Panama's President Ricardo Martinelli (L), review the honor guard during a welcoming ceremony in the National Palace, in Mexico City, capital of Mexico, on March 24, 2014. Ricardo Martinelli is on an official visit to Mexico. (Xinhua/Alejandro Ayala)