Follow
1. US imposed sanctions for a reason. Cuba ignores them.
2. Sanctions are not absolute. Cuba trades with EU *and* with US.
Now forget sanctions, it's 100% choice of Cuban regime to:
3. Stick to a weird mix of communist-capitalist state-controlled economy
4. Keep political prisoners and thwart opposition
5. Restrict people's right to travel
6. Restrict people's right to do business as they like
7. Protect the businesses of Castro dynasty & their friends