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SOCHI, RUSSIA - MAY 19: (RUSSIA OUT) Cambodia's Prime Minister Hun Sen attends a meeting with Russian President Vladimir Putin at Bocharov Ruchey State Residence on May 19, 2016 in Sochi, Russia. Leaders of ASEAN states have arrived in Russia's Black Sea resort city of Sochi to attend the Russia-ASEAN Summit. (Photo by Mikhail Svetlov/Getty Images)

SOCHI, RUSSIA - MAY 19:  (RUSSIA OUT) Cambodia's Prime Minister Hun Sen attends a meeting with Russian President Vladimir Putin at Bocharov Ruchey State Residence on May 19, 2016 in Sochi, Russia. Leaders of ASEAN states have arrived in Russia's Black Sea resort city of Sochi to attend the Russia-ASEAN Summit. (Photo by Mikhail Svetlov/Getty Images)

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PHNOM PENH, CAMBODIA - JULY 16: Opposition Cambodian National Rescue Party leader Kem Sokha gives a speech to supporters near the barricades set up to impede access to demonstrators, human rights observers and members of the press to the Municipal Court on July 16, 2014 in Phnom Penh, Cambodia. Hundreds of protesters demonstrate outside of the Phnom Penh Municipal Court of First Instance in support of five elected Members of Parliament from the opposition Cambodian National Rescue Party in Phnom Penh, Cambodia. Yesterday, 15 July 2014, parliamentarians Mu Sochua, Ho Vann, Men Sothavrin and Keo Phirum were arrested after demonstrations Tuesday morning turned violent, with several municipal security guards severely beaten by protesters. Two other CNRP members were arrested on Wednesday: Real Khemarin and Ouer Narith. The parliamentarians were held overnight by the authorities and brought to court early today morning for questioning by the investigative judge. (Photo by Omar Havana/Getty Images)

PHNOM PENH, CAMBODIA - JULY 16:  Opposition Cambodian National Rescue Party leader Kem Sokha gives a speech to supporters near the barricades set up to impede access to demonstrators, human rights observers and members of the press to the Municipal Court on July 16, 2014 in Phnom Penh, Cambodia. Hundreds of protesters demonstrate outside of the Phnom Penh Municipal Court of First Instance in support of five elected Members of Parliament from the opposition Cambodian National Rescue Party in Phnom Penh, Cambodia. Yesterday, 15 July 2014, parliamentarians Mu Sochua, Ho Vann, Men Sothavrin and Keo Phirum were arrested after demonstrations Tuesday morning turned violent, with several municipal security guards severely beaten by protesters. Two other CNRP members were arrested on Wednesday: Real Khemarin and Ouer Narith. The parliamentarians were held overnight by the authorities and brought to court early today morning for questioning by the investigative judge. (Photo by Omar Havana/Getty Images)

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Hun Sen, Cambodia's prime minister, speaks during the World Economic Forum for Association of Southeast Asian Nations (ASEAN) in Kuala Lumpur, Malaysia, on Wednesday, June 1, 2016. Malaysia appointed new directors to 1Malaysia Development Bhd. after dissolving the advisory board that was headed by Najib amid global investigations into alleged money laundering and embezzlement at the state fund. Photographer: Charles Pertwee/Bloomberg via Getty Images

Hun Sen, Cambodia's prime minister, speaks during the World Economic Forum for Association of Southeast Asian Nations (ASEAN) in Kuala Lumpur, Malaysia, on Wednesday, June 1, 2016. Malaysia appointed new directors to 1Malaysia Development Bhd. after dissolving the advisory board that was headed by Najib amid global investigations into alleged money laundering and embezzlement at the state fund. Photographer: Charles Pertwee/Bloomberg via Getty Images

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Hun Sen, Cambodia's prime minister, speaks during a news conference in Bangkok, Thailand, on Saturday, Dec. 19, 2015. Thai Prime Minister Prayuth Chan-Ocha and Cambodian Prime Minister Hun Sen agreed to triple trade and investment by promoting special economic zone and improving transport links, says Werachon Sukondhapatipak, a Thai government spokesman. Photographer: Dario Pignatelli/Bloomberg via Getty Images

Hun Sen, Cambodia's prime minister, speaks during a news conference in Bangkok, Thailand, on Saturday, Dec. 19, 2015. Thai Prime Minister Prayuth Chan-Ocha and Cambodian Prime Minister Hun Sen agreed to triple trade and investment by promoting special economic zone and improving transport links, says Werachon Sukondhapatipak, a Thai government spokesman. Photographer: Dario Pignatelli/Bloomberg via Getty Images

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PHNOM PENH, CAMBODIA - JULY 16: Kem Sokha, opposition Cambodian National Rescue Party leader, and other members of the party hold hands together during a demonstration near the Municipal Court on July 16, 2014 in Phnom Penh, Cambodia. Hundreds of protesters demonstrate outside of the Phnom Penh Municipal Court of First Instance in support of five elected Members of Parliament from the opposition Cambodian National Rescue Party in Phnom Penh, Cambodia. Yesterday, 15 July 2014, parliamentarians Mu Sochua, Ho Vann, Men Sothavrin and Keo Phirum were arrested after demonstrations Tuesday morning turned violent, with several municipal security guards severely beaten by protesters. Two other CNRP members were arrested on Wednesday: Real Khemarin and Ouer Narith. The parliamentarians were held overnight by the authorities and brought to court early today morning for questioning by the investigative judge. (Photo by Omar Havana/Getty Images)

PHNOM PENH, CAMBODIA - JULY 16:  Kem Sokha, opposition Cambodian National Rescue Party leader, and other members of the party hold hands together during a demonstration near the Municipal Court on July 16, 2014 in Phnom Penh, Cambodia. Hundreds of protesters demonstrate outside of the Phnom Penh Municipal Court of First Instance in support of five elected Members of Parliament from the opposition Cambodian National Rescue Party in Phnom Penh, Cambodia. Yesterday, 15 July 2014, parliamentarians Mu Sochua, Ho Vann, Men Sothavrin and Keo Phirum were arrested after demonstrations Tuesday morning turned violent, with several municipal security guards severely beaten by protesters. Two other CNRP members were arrested on Wednesday: Real Khemarin and Ouer Narith. The parliamentarians were held overnight by the authorities and brought to court early today morning for questioning by the investigative judge. (Photo by Omar Havana/Getty Images)