WASHINGTON (AP) — The United States offered to let a convicted Cuban spy return home in exchange for the release of an imprisoned American, but Cuba rebuffed the offer, U.S. officials said. The U.S. also indicated it would be willing to address other Cuban grievances after Havana had released imprisoned contractor Alan Gross, according to the officials, who spoke on condition of anonymity because the sensitivity of the issue. Cuba rejected the offer, noting that the Cuban, Rene Gonzalez, already had served most of his sentence. It wanted pardons for at least some of the four other Cubans convicted with...