This landmark decision came only days after the U.S. Embassy in Phnom Penh celebrated the sixtieth anniversary of the restoration of U.S.-Cambodian relations. U.S. officials made no mention of their critical role in helping Pol Pot’s forces come to power. Nor did the trio of former U.S. ambassadors—Charles Ray, Kent Wiedemann, and Joseph Mussomeli—issue any apologies during the two-day celebration for the Nixon administration’s secret B-52 bombings that inflicted massive destruction on the Cambodian countryside or for U.S. diplomatic support for the Khmer Rouge from 1979 to 1990.
During his trial, Duch testified that the Khmer Rouge would have likely died out if the United States had not promoted a military coup d'état in 1970 against the non-aligned government led by Prince Norodom Sihanouk. "I think the Khmer Rouge would already have been demolished," he said of their status by 1970,"But Mr. Kissinger [then U.S. secretary of state] and Richard Nixon were quick [to back coup leader] Gen. Lon Nol, and then the Khmer Rouge noted the golden opportunity."
Because of this alliance, the Khmer Rouge was able to build up its power over the course of their 1970-75 war against the Lon Nol regime, Duch told the tribunal.