This handout photo from the Twitter account of Sen. Jeff Flake, R-Ariz. shows Alan Gross arriving at Andrews Air Force Base, Md., Wednesday, Dec. 17, 2014. The US and Cuba have agreed to re-establish diplomatic relations and open economic and travel ties, marking a historic shift in U.S. policy toward the communist island after a half-century of enmity dating back to the Cold War, American officials said Wednesday. The announcement came amid a series of sudden confidence-building measures between the longtime foes, including the release of American prisoner Alan Gross, as well as a swap for a U.S. intelligence asset held in Cuba and the freeing of three Cubans jailed in the U.S. Gross' wife Judy is at center.

Credit: (AP Photo/Sen. Jeff Flake)

PHOTOS: Alan Gross’ release from Cuba

The US and Cuba have agreed to re-establish diplomatic relations and open economic and travel ties, marking a historic shift in U.S. policy …