The phrase transactions which involve property in which a designated foreign country, or any national thereof, has any interest of any nature whatsoever, direct or indirect, includes, but not by way of limitation:
(a) Any payment or transfer to such designated foreign country or national thereof,
(b) Any export or withdrawal from the United States to such designated foreign country, and
(c) Any transfer of credit, or payment of an obligation, expressed in terms of the currency of such designated foreign country.