It is not news that China has been trying to establish control and authority over global politics. It has gone to lengths to develop and fulfill its hegemonic interests in Southeast Asia.
China’s Cambodian dream is a new link to the chain, a process of setting outposts for controlling Southeast Asia. China’s upcoming naval base in Cambodia is an example of such an outpost.
The key factors behind China’s choice of Cambodia are the political background of good relations with the non-democratic Hun Sen regime in Cambodia, the economic background of being a country where Chinese investment concentrates and many Chinese businesses/companies have established operations, and the historical background of having unsolved land border demarcation issues with Vietnam, which is a Chinese rival in conflict over the South China Sea.
In full: https://eurasiantimes.com/controlling-southeast-asia-chinas-cambodian-dream-is-nothing-but-a-debt-trap-security-concerns-for-asia/