Section 300.304 - Prohibitions(a) It is unlawful for a foreign, listed IUU vessel denied entry under § 300.302 to enter any port or place subject to the jurisdiction of the United States.(b) It is unlawful for any foreign, listed IUU vessel to obtain port services or engage in commercial transactions, or attempt to obtain such services or engage in such transactions, if such activities have been denied or prohibited under § 300.303(b) and/or § 300.303(c) , or if the vessel has been denied entry under § 300.302 .(c) It is unlawful for any person, without prior authorization from the Assistant Administrator, to engage in commercial transactions with listed IUU vessels. Such transactions include, but are not limited to:(2) Processing fish harvested or landed by a listed IUU vessel or processing fish using a listed IUU vessel;(3) Joint fishing operations;(4) Providing supplies, fuel, crew, or otherwise supporting a listed IUU vessel; or(5) Chartering or entering in a chartering arrangement with a listed IUU vessel.(d) The prohibitions listed in § 300.304(c) shall not apply when the Assistant Administrator has authorized a listed IUU vessel to access such port services or engage in such commercial transactions, in accordance with applicable provisions of RFMO conservation and management measures, including in cases of force majeure and where the Assistant Administrator has determined that such services are essential to the safety, health, and welfare of the crew.