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.
Duch is helping prosecutors describe the inner workings of the Khmer Rouge regime as they seek to tie three suspects to atrocity crimes.
The future of project is unclear, and many families have already been moved from proposed railway improvement sites.
His role in the rise of the Khmer Rouge has not so far been closely examined by the court, and he has never given testimony.
At least 200 people took part in the five-day campaign, which ended Wednesday and covered four provinces.
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.
Nuon Chea is on trial for atrocity crimes alongside two other Khmer Rouge leaders, Khieu Samphan and Nuon Chea.
An Australian newspaper reported Monday that Australian police suspect Hun To of “heroin trafficking and money laundering.”
You Bunleng said in a written response Monday the Swiss judge had “committed professional mistakes” and had resigned as a result.
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.