Section 515.201 prohibits the presentation, acceptance or payment of:
(a) Drafts or other orders for payment drawn under irrevocable letters of credit issued in favor or on behalf of any designated national;
(b) Drafts or other orders for payment, in which any designated national has on or since the ``effective date'' had any interest, drawn under any irrevocable letter of credit; and
(c) Documentary drafts in which any designated national has on or since the ``effective date'' had any interest.