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MEXICO CITY, MEXICO - MAY 24: Federica Mogherini, High Representative of the EU for Foreign Affairs and Security Policy, delivers a speech along with Claudia Ruiz Massieu (not seen), Secretary of Foreign Affairs of Mexico in the Ministry of Foreign Affairs on May 24, 2016 in Mexico City, Mexico. (Photo by Manuel Velasquez/Anadolu Agency/Getty Images)

MEXICO CITY, MEXICO - MAY 24: Federica Mogherini, High Representative of the EU for Foreign Affairs and Security Policy, delivers a speech along with Claudia Ruiz Massieu (not seen), Secretary of Foreign Affairs of Mexico in the Ministry of Foreign Affairs on May 24, 2016 in Mexico City, Mexico.  (Photo by Manuel Velasquez/Anadolu Agency/Getty Images)