Gustavo Machin, Cuba's deputy chief of North American affairs, speaks to reporters in at the Foreign Ministry in Havana, Cuba, Thursday, May 12, 2016, ahead of Monday's meeting between U.N. representatives from the United States and Cuba. Behind are pictures of Cuba's President Raul Castro, left, his brother Fidel Castro, center, and rebel leader Ernesto "Che" Guevara speaking at the U.N. in 1964. (AP Photo/Ramon Espinosa, Pool)