Hu’s visit, the first from a Chinese head of state in 12 years, comes as Phnom Penh is hosting five days of Asean meetings.
Taken together, the meetings will be an indication of Cambodia’s Asean priorities.
The March 30, 1997, attack on an opposition rally killed 16 people and wounded hundreds more.
Chan Cheng is accused of helping Meas Peng flee detention after Meas Peng was accused of incitement during land protests in Kandal.
Cambodia is preparing to host an Asean summit later this week, but it has said the South China Sea will not be on the agenda.
Sam Rainsy told VOA's Khmer service Thursday that officials in the government of Prime Minister Hun Sen "fear a serious investigation."
Cambodia has 2.3 million hectares of land under concessions, a new report by the rights group Adhoc says.
In a 14-page memo, Kasper-Ansermet said Cambodian staff followed the instructions of his Cambodian counterpart, You Bunleng, only.
Duch said Wednesday that Pol Pot and Nuon Chea “monopolized” decisions on “policy, commerce, the economy and the military.”
Chhouk Bandith was questioned by the provincial court last week but walked away without being held.
Kasper-Ansermet’s resignation throws further doubt of moving forward with a group of additional prosecutions known as cases 003 and 004.
During testimony Tuesday, Duch admitted he was “not clear” on the policymaking of the regime.