19 November 1941
When our diplomatic relations are becoming dangerous, we will add the following at the beginning and end of our general intelligence broadcasts:
(1) If it is Japan-U. S. relations, "HIGASHI".
(2) Japan-Russia relations, "KITA".
(3) Japan-British relations, (including Thai, Malaya and N. E. I.); "NISHI".
The above will be repeated five times and included at beginning and end.
Relay to Rio de Janeiro, Buenos Aires, Mexico City, San Francisco.
JD-1: 6850 (Y) Navy Trans. 11-26-41 (S)
(EXHIBITS OF JOINT COMMITTEE , EXHIBIT NO. 1 INTERCEPTED DIPLOMATIC MESSAGES SENT BY THE JAPANESE GOVERNMENT BETWEEN JULY l AND DECEMBER 8, 1941)