543.405—Provision of services.
        
        (a) 
         The prohibitions on transactions involving blocked property contained in  § 543.201 apply to services performed in the United States or by U.S. persons, wherever located, including by an overseas branch of an entity located in the United States:
    
    
        
        (1) 
         On behalf of or for the benefit of a person whose property and interests in property are blocked pursuant to  § 543.201(a); or
    
    
    
        
        (b) Example.
         U.S. persons may not, except as authorized by or pursuant to this part, provide legal, accounting, financial, brokering, freight forwarding, transportation, public relations, or other services to a person whose property and interests in property are blocked pursuant to  § 543.201(a).