Obama wraps up tense visit

Two leaders concede significant differences, big challenges linger between longtime foes

Before boarding Air Force One bound for Argentina, Obama and his Cuban counterpart Raul Castro shook hands in a demonstration of shared willingness to continue the process of normalizing bilateral ties they jointly announced in late 2014. The two countries restored diplomatic relations last July.

Obama began the visit on Sunday and arrived in Havana with his wife, daughters and mother-in-law, as well as 40 members of Congress and a business delegation.