Yes, but Cuba never did this whereas the US attacked a defenseless ship returning from war games and killed 87 Iranian sailors.

It was a warship in a war. So fuck the US in general, but that is a bad example of illegality.

The US has also been attacking civilian fishing ships claiming they are narco terrorists summarily executing civilians without trial.

Yes, that was also illegal. But that was not part of the Cuba embargo.

The US is doing a lot of illegal shit right now. But if you want to argue that the US is doing illegal shit related to Cuba, you need to actually cite examples related to Cuba.