I don’t understand why China/Russia haven’t sorted out a land-based pipeline between them yet, and cut out all these straits.The Bering Strait (between Russia's Kamchatka and US' Alaska) and Soya Strait (between Russia's Sakhalin and Japan's Hokkaido) could still be a significant problem, assuming that Vladivostok can be used as destination port to unload oil before transporting them to neighbouring Heilongjiang.
Of course, for this to happen would require Russia to:
1 - Be neutral in case of China-US conflict, and
2 - Have a lot of Russian-flagged oil and gas tankers at their disposal.
If the destination port is in China, then there's the Korea Strait or the Miyako Strait, which is definitely a big no-no.
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It’s the sort of project that both of them (but particularly China) would benefit from. Surely it should be something they just throw money at?
The other route for China to get oil is via a Pakistan-Iran corridor, which, to be fair, they are funding, but not at the pace I’d expect for a national security interest.