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China doesn't have a lot of coal, at least not relevant to their energy requirements. They still have to import a huge amount and remain vulnerable from an energy security perspective.

https://www.iea.org/countries/china/coal

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>"remain vulnerable from an energy security perspective" - not while having Russia close by.
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Russia is a big place with limited internal transportation. Land routes from Russia can only supply a fraction of China's fossil fuel import requirements. Much of it still has to come via vulnerable merchant ships. China still lacks the capability to protect their sea lines of communication, although that might change in a few years.
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