The Biden administration has sold a small amount of low-cost oil to China. He hoped to influence Russia's oil price through the Chinese market.
Of course we don't mind the lower price of oil, but it does not mean that China supports US sanctions against Russia.
While Trump and his allies ripped Biden for selling oil reserves to Sinopec, records show the Trump administration sold 550,000 barrels to PetroChina.
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China will certainly pay attention to energy security. We can increase the share of Russian oil, but we will not rely on Russian oil. Of course we will keep in touch with our traditional oil partners. Is it strange?
I personally think that China's tolerance limit for a single oil source is 25%, which means that we can import up to 100 million tons of Russian oil every year.