The only way I can see for you to help, (NOT the US, You! The US Gov will screw everybody if they stick their dick in.) is to get a Cuban expat group together, and find out who's doing what there, and get the Cubans in the US to back a faction.
The Cuban expats might need to send guns, men, food and medicine, and they'll have to keep control of what they send to maintain leverage. And, still, it's likely to go tits up.
Not directly related, but it shows some potential problems. My mom got a bunch of feminist women together 40 odd years ago, and they funded a school for girls in Pakistan. For 25 years, they send money off, and were told 'All good.' Then, another charity was sending somebody over there to check on another charity's stuff, and they paid him to look in on theirs.
Turns out the school? Only taught boys.
The feminists had been funding an all boys school the whole time. The locals were quite happy to have a school, but for girls? No, that'd get the girls killed.
To boil it down? The moment it's out of your sight, it's also out of your control. If you want things to get better, DO IT YOURSELF.