I sponsored my husband as a fiance during the improved times in US- Cuban relations ( 2 years ago) and he was denied, we are waiting now for our interview date after being approved by NVC. In current climate, I doubt any fiance from Cuba can be approved for the visa so choose the nearest US embassy if you want to try. I pray to God that wherever they'll send us ( I'll go with him), he will be approved. To qualify for the visa to Mexico or any other "hot" Spanish speaking destination, they need to have a good income in Cuba, own the house, money on the account...Good luck!