Diệm appointed Luyện as ambassador to the United Kingdom. Diệm and another brother, Ngô Đình Nhu, were executed on 2 November 1963 during a military coup. Another brother, Ngô Đình Cẩn, was captured a few days later and eventually sentenced to death and executed. Luyện was able to escape assassination because he was in London at the time.
Luyện and Thục were the only brothers to survive the political upheavals in Vietnam.[1]