Other leaders expected to attend include Chancellor Willy Brandt of West Germany, Em peror. Haile Selassie of Ethi opia, Queen Juliana of the Netherlands and President Giu seppe Saragat of Italy.National mourning until the end of the month has been pro claimed, and all flags have been placed at halfâstaff.As the mourning began, the French National Assembly ad journed its session. The regular Thursday meeting of the Viet nam peace talks was postponed for a week and the general conference of the United Na tions Educational. Scientific and Cultural Organization met and recessed.