Un Sokhom was the editor in chief of the Neak Prayuth newspaper until he fled to the US in 2004 in fear of his safety.
Organizers of the Cambodian Confederation of Unions had planned to show the film, which questions the motives behind the 2004 murder.
Cambodia has sought similar deals in Middle Eastern countries like Kuwait and Qatar, where food shortages are a concern.
The Ministry of Foreign Affairs issued an unexplained letter to embassies on Tuesday.
The phone purchase was just one example the Nobel Prize laureate gave as he described his country’s battle against corruption.
The Khmer Rouge ruled for only four years, but it has taken more than 30 to relieve the trauma, he said. And it’s still there.
Prime Minister Hun Sen on Wednesday said he was committed to fighting terrorism, with the participation of Cambodian citizens.
Mu Sochua, a member of the Sam Rainsy Party, was fined for remarks made in connection with a lawsuit against Prime Minister Hun Sen.
It is important students learn about the Khmer Rouge era.
She wants the prosecutions to end with the five people already in custody.
The temple is at the heart of a border dispute between the two neighbors.
Both sides withdrew their respective ambassadors in November 2009, following the appointment of Thaksin as economic adviser to Hun Sen.