into force on March 19, 1967, or other international obligations. (3) Exception for safety of vessels and crew Sanctions under this section shall not apply with respect to a person providing provisions to a vessel if such provisions are intended for the safety and care of the crew aboard the vessel, or the maintenance of the vessel to avoid any environmental or other significant damage. (4) Humanitarian exception The President may not impose sanctions under this section with respect to any person for conducting or facilitating a transaction for the sale of agricultural commodities, food, medicine, or medical devices or for the provision of humanitarian assistance. (f) Rulemaking (1) In general Agencies responsible for the implementation of this section may promulgate such rules and regulations as may be necessary to carry out the provisions of this section (which may include regulatory exceptions), including under section 205 of the International Emergency Economic Powers Act ( 50 U.S.C. 1704 ). (2) Rule of construction Nothing in this section may be construed to limit the authority of the President pursuant to the International Emergency Economic Powers Act ( 50 U.S.C. 1701 et seq. ). (g) Definitions In this section: (1) The term foreign person means an individual or entity that is not a United States person. (2) The term United States person means— (A) a United States citizen or an alien lawfully admitted for permanent residence to the United States