I ready in an article that Mexico sent home a group of illegal Cuban immigrants:

Mexico sent home the first group of illegal Cuban migrants under a new accord aimed at cutting off an increasingly violent human-trafficking route to the United States, the government said Thursday.   The agreement (it's official title was not mentioned in the article), signed by Cuban Foreign Minister Felipe Perez Roque and Mexican Foreign Secretary Patricia Espinosa, also criticized the U.S. "wet-foot, dry-foot" policy, which generally allows Cubans who touch U.S. soil to stay, while turning back most caught at sea.  Before Mexico signed the agreement with Cuba in October, authorities rarely sent migrants back to the communist island.