31 C.F.R. § 589.518
(a) To the extent that such activities are not exempt from this part, and subject to the restrictions set forth in paragraphs (b) through (d) of this section, U.S. persons are authorized to engage in all transactions necessary and ordinarily incident to the publishing and marketing of manuscripts, books, journals, and newspapers in paper or electronic format (collectively, “written publications”) involving the Crimea region of Ukraine. This paragraph does not apply if the parties to the transactions described in this paragraph include any person whose property and interests in property are blocked pursuant to § 589.201. Pursuant to this section, the following activities are authorized, provided that U.S. persons ensure that they are not engaging, without separate authorization, in the activities identified in paragraphs (b) through (d) of this section:
(3)
(b) This section does not authorize transactions involving the provision of goods or services not necessary and ordinarily incident to the publishing and marketing of written publications as described in paragraph (a) of this section. For example, this section does not authorize persons subject to the jurisdiction of the United States:
(d) This section does not authorize: