31 C.F.R. § 546.405
(a) The prohibitions on transactions involving blocked property contained in § 546.201 apply to services performed in the United States or by U.S. persons, wherever located, including by an overseas branch of an entity located in the United States:
Note to § 546.405: See §§ 546.507 and 546.509 on licensing policy with regard to the provision of certain legal or medical services.
[74 FR 25432, May 28, 2009, as amended at 89 FR 15749, Mar. 5, 2024]