If you click the link…

> [You certify to LetsEncrypt that] …

> You are not a person or entity that is: (a) located in, organized under the laws of, or ordinarily resident in any country or territory that is the target of comprehensive U.S. sanctions; (b) a prohibited or restricted party under U.S. or other applicable sanctions and export control laws and regulations; or (c) owned or controlled by or acting on behalf of anyone described in (a) or (b). You agree to use Let’s Encrypt Certificates and any services provided by or on behalf of ISRG in compliance with applicable U.S. export control and sanctions laws and regulations.

It took me a minute to understand the original post because the verb sanction means both itself and basically the opposite of itself. It would be better to say "any territory that the US has levied sanctions against". I thought LetsEncrypt had banned its usage in the US! The word for words like sanction is contronym.