Kennedy placed this call after having held crisis meetings with advisers all day. Macmillan received the call around midnight London time. U Thant, acting secretary-general of the United Nations, had been holding round-the-clock talks in New York. In the latest development, US Ambassador to the United Nations, Adlai Stevenson∇, had met with U Thant earlier that day in New York. U Thant, in turn, had been talking Soviet Ambassador to the United Nations Valerian Zorin.