Only Russia can potentially supply by land. However, the largest LNG resource Russia has is in the Arctic Circle.
You think its just across the border?
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What kind of infrastructure do you think it would take to build a pipeline from that **red** dot on top all the way to China. To ship from that red dot all the way to Dalian, you need to take the Northeast Passage.
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Its shorter than going through the Indian Ocean, less the Indian and Australian Navy wants to be a menace, and you don't have to pay an arm and a leg for Suez Canal transit fees, which is goes from hundreds of thousands of dollars per ship.
Even your article shows a gassification plant that happens to be in Dalian, which is a coastal city. In a peninsula. That is not by any means, easy geography. That Dalian plant would have to rely on ship borne sources.
If you want LNG on the western to central parts of China, then pipelines from Kazakhstan would make sense. But for those along the coast, ship borne makes more sense. Static pipelines limit you to one supplier only, which is Kazakhstan, and that also puts you in the mercy of politics there and whatever price they demand.
Variations on the market isn't based on time, but region. Let's say a city like Qingdao may want to pay for more than say in Shenzhen. You can easily adjust for regional demand. If you have oversupply, you can sell it to Korea or Japan if their buying price is right and interests you.