東南アジア条約機構
Thailand reacted angrily. It announced it would boycott meetings of the Southeast Asia Treaty Organization, with Thai officials saying this step was to protest a U.S. bias toward Cambodia in the dispute. As evidence, Thai officials cited Acheson's role as Cambodia's advocate; the U.S. government replied that Acheson was merely acting as a private attorney, engaged by Cambodia. Mass demonstrations were staged in Thailand protesting the ruling.