Although extradition does not require an extradition treaty, the fact that Cuba doesn't play nice with the U.S. diplomatically (remember Elian Gonzalez?) will ensure that your new Cuban government denies any request to send you back. Per countries with no extradition treaty with the US government, the process of extradition https://englishspeakinglawyer.com/international-criminal-defense-attorneys?limit=100&start=3600