Yes. Summer of 1980.
Grain embargo on USSR, don't recall anyone starving.
Per Iran, I don't care if they don't wan to sell THEIR oil, but that isn't what they have in mind.
The truth is that Iran would quickly be reduced to economic ruin if we blockaded their ocean going imports and exports.
Yes they have land borders, but its tough to truck that much oil, and their neighbors will be taking a sizable cut for the access.