With which countries are FCC-licensed amateur radio stations prohibited from exchanging communications?
Any country whose administration has notified the International Telecommunication Union (ITU) that it objects to such communications✓Bonne réponse
Any country whose administration has notified the American Radio Relay League (ARRL) that it objects to such communications
Any country banned from such communications by the International Amateur Radio Union (IARU)
Any country banned from making such communications by the American Radio Relay League (ARRL)
Explication
The bar is set by an administration formally objecting to the ITU, and the FCC publishes the resulting arrangements. Neither the ARRL nor the IARU has any power to prohibit contacts, since both are private associations.