Los desafíos de las migraciones para una estrategia global de la Union Europea doc_120.pdf Autor(es) OSPINA Gloria Inés Palabra(s) clave ACNUR FRONTEX European Union Immigration law Migrant workers Migrants Irregular migration flows Immigration Migration Migration policy Restrictive migration policies Refugees Readmission agreements Global Strategy Global Security Strategy of the European Union Defence and security policy European Security Internal Security National Security Año de publicación 2016