All conglomerates are closely connected to the state to varying degrees. The US & Britain didn't install the Shah of Iran for nothing.
No country has a perfect environmental record for drilling. Recently it was
a Western company that caused a spill in China.
China has a natural interest in all areas where there will be energy deposits, and Chinese investments in any areas already under the sovereign domain of another country will naturally go through the authorities of that country and some arrangement will be made that is jointly beneficial to the host country.
