Cuba has harbored U.S. fugitives in the past, though most of those cases date back to the 1960s and '70s, when the island became a refuge for members of the Black Panthers and other militant groups. More recently, dozens of Cuban Medicare fraud fugitives in the U.S. have tried to escape prosecution by returning to the island.
But Cuba has also cooperated with U.S. authorities in returning several criminal fugitives in recent years, including Leonard B. Auerbach in 2008. Auerbach was wanted in California on federal charges of sexually abusing a Costa Rican girl and possessing child pornography. He was deported.
In 2011, U.S. marshals flew to Cuba and took custody of two U.S. suspects wanted in a New Jersey slaying.
Hakken lost custody of his sons last year after a drug possession arrest in Louisiana and later tried to take the children from a foster home at gunpoint, authorities said. A warrant had been issued for his arrest on two counts of kidnapping; interference with child custody; child neglect; false imprisonment and other charges.
Hakken entered his mother-in-law's Florida house last Wednesday, tied her up and fled with his sons, the sheriff's department has said. Federal, state and local authorities searched by air and sea for a boat Hakken had recently bought. The truck that Hakken, his wife and the boys had been traveling in was found Thursday, abandoned in Madeira Beach, Florida.
The family's flight to Cuba harkened back to the 1999 child custody case involving Elian Gonzalez, though unlike Gonzalez, the Hakkens had no apparent ties to the island.
In 1999, 5-year-old Gonzalez was found clinging to an inner tube off Florida after his mother and others drowned while fleeing Cuba toward American soil. The boy was taken to Miami to live with relatives, but his father in Cuba demanded the boy be sent back.
U.S. courts ultimately ruled Gonzalez should be sent back, though his Miami relatives refused to return him. In April 2000, U.S. federal agents raided the family's home and he was returned to Cuba soon after. He has since grown into a young man and joined a military academy.