31 CFR 510.211: Prohibited facilitation.

(a) Except as otherwise authorized, U.S. persons, wherever located, are prohibited from approving, financing, facilitating, or guaranteeing a transaction by a foreign person where the transaction by that foreign person would be prohibited by § 510.201(d), § 510.206, or § 510.209 if performed by a U.S. person or within the United States.

(b)(1) The prohibitions in this section with respect to § 510.201(d) apply except to the extent provided by regulations, orders, directives, or licenses that may be issued pursuant to this part, and notwithstanding any contract entered into or any license or permit granted prior to the effective date.

(2) The prohibitions in this section with respect to §§ 510.206 and 510.209 apply except to the extent provided in regulations, orders, directives, or licenses that may be issued pursuant to this part or pursuant to the export control authorities implemented by the U.S. Department of Commerce, and notwithstanding any contract entered into or any license or permit granted prior to the effective date.