By March 1955 , the Minister for External Affairs , Liam Cosgrave , announced that : “ Ireland 's application for membership of the U.N.O. still stands although it remains blocked by an objection in the Security Council . ” For reasons of diplomacy the government would not state the reason for the objection , nor which country had made it . Sean MacBride considered that the UN boycott of Ireland was originally agreed at the 1945 Yalta Conference by Churchill and Stalin . Ireland 's acceptance into the UN was announced by John A. Costello on 15 December 1955
Yalta Conference
Yalta Conference
Irish neutrality during World War II