Governments of the United States of America and the Union of Soviet Socialist Republics, Memorandum of Understanding Between the United States of America and the Union of Soviet Socialist… (1963)
“ For use in time of emergency the Government of the United States of America and the Government of the Union of Soviet Socialist Republics have agreed to establish as soon as technically feasible a direct communications link between the two Governments.Each Government shall be responsible for the arrangements for the link on its own territory. Each Government shall take the necessary steps to ensure continuous functioning of the link and prompt delivery to its head of government of any communications received by means of the link from the head of government of the other party. ”
