Unrelated 3rd party gets mad at 1st party for transaction with 2nd party. 4th party (neighbor of 2nd party) steals transacted item on behalf of 3rd party. Seems legit.

I figured US sanctions in this case would just limit which companies can interact with US based companies and within US borders, isn't that how sanctions on Cuba work? Obviously the US just does what it wants but it's not clear to me how this was legally justified, if at all.