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. For those on the run like alleged NSA leaker Edward Snowden, most countries do https://directmysocial.com/story3163616/la-guida-pi%C3%B9-grande-per-no-extradition-countries