In the past, Nuon Chea and Ieng Sary’s defense officials have requested the former king be summoned, to no avail.
The court will now move on toward the hearings of evidence, beginning Dec. 5.
Subedi spoke to VOA Khmer after he was a guest speaker for a conference on the Paris Peace Accords in Berkeley, California.
Nuon Chea, the man known as Brother No. 2 of the Khmer Rouge, addressed tribunal judges on Tuesday.
Sleuk Rith will include studies on genocide, conflict, human rights and national and regional development, as well as a museum.
The list of alleged crimes includes murder, extermination, enslavement, imprisonment, torture, and willful killing, among others.
The welcomed proceedings marked the first substantial hearing for the three leaders, which has taken four years to bring them to trial.
Seng Theary said Wednesday the court had damaged the confidence of Cambodians in its ability provide justice.
The chamber judges were split on whether she should be released from detention or moved to a hospital under detention.
Three Khmer Rouge survivors will stay in Cambodia for one week to witness the first substantial hearing of the trial to date.
The Trial Chamber of the Khmer Rouge Tribunal said Wednesday that Nuon Chea is fit to stand trial, in proceedings set to begin Nov. 21.
Seng Theary had been a civil party complainant in both case 003 and 004.