Assistant Secretary of State of the Bureau of Western Hemisphere Affairs Roberta S. Jacobson, flanked by Jeffrey DeLaurentis, left, chief of mission at the U.S. Interests Section in Havana, and Deputy Assistant Secretary of the Bureau of Western Hemisphere Affairs Edward Alex Lee, right, start the second day negotiations with Cuban officials, in Havana, Cuba, Thursday, Jan. 22, 2015. U.S. objectives during Thursday's session include the lifting of restrictions on American diplomats in Cuba and assurances that Cubans will have unfettered access to a future U.S. Embassy in Havana. (AP Photo/Ramon Espinosa)HAVANA (AP) — The United States and Cuba made progress Thursday toward restoring diplomatic ties and embassies as promised by their leaders, even as key officials warned that re-establishing normal relations after more than 50 years of animosity faced a long and complicated process.