"These war crimes and crimes against humanity were not committed by the Cambodian people. It was the Vietnamese who killed Cambodians."
He is one of three elderly men on trial for their roles in the 1975-79 reign of the Khmer Rouge. Estimates have suggested that up to 1.7 million people were either executed or died of starvation or disease as the regime forced people to live in agricultural labour camps.
Nuon Chea, with Khieu Samphan, 80, the former head of state, and 86-year-old Ieng Sary, the one-time Foreign Minister, are all charged with crimes against humanity, genocide, religious persecution, homicide and torture.
They deny the charges and Ieng Sary has indicated he will not co-operate with the tribunal.
A fourth senior figure, the Social Affairs Minister Ieng Thirith, was recently declared unfit for trial because she has dementia.
- Independent