They're "from" the US companies, but not directly. There's already issues with counterfeiting (you order TI parts and get something else); this is the reverse, where the parts are bought by some kind of "straw buyer" in a neutral country and then resold to Iran.
It's tricky. It would require a huge amount of surveillance to prevent it from happening, or an even more aggressive physical blockade of Iran. And of course there's always the possibility of China->Russia->Iran shipment by air.
It's tricky. It would require a huge amount of surveillance to prevent it from happening, or an even more aggressive physical blockade of Iran. And of course there's always the possibility of China->Russia->Iran shipment by air.