"We support the one-China policy and respect China's sovereignty," he said during a dinner with about 5,240 Khmer-Chinese and overseas Chinese. "Taiwan is just a province of China."
The prime minister added that the government also supported the one-China policy on the issue involving Tibet, saying that he had rejected Tibet monks' requests to come to Cambodia.
"Tibet also belongs to China," Hun Sen said.
He called on all Khmer-Chinese and overseas Chinese in the kingdom to back the Cambodian government in the implementation of the one-China policy.
"The peaceful rise of China does not pose a threat to others, but, through its policy of good-neighborliness and the Belt and Road initiative, brings benefits to developing countries in Asia and other regions," Hun Sen said.