European Union Blocking Statute
en.wikipedia.org
en.wikipedia.org
Important to post this because many European citizens and companies are unknowingly admitting to breaking the law when they post about boycotting Iran for supplying drones/missiles to Russia.
It only applies if the boycotting company terminates contract with a party in Iran in order to comply with US sanctions. If the company doesn't want to have business with Iran voluntary for other reasons, and can prove it, it's not illegal.
See e.g. https://www.lw.com/admin/upload/SiteAttachments/Alert%202919...