https://www.reuters.com/business/energy/russia-finalising-po...
It's not clear how US plans to block oil supply going forward here. Also, worth noting that unlike the west, China is taking alternative energy seriously. China is far ahead in terms of using renewable energy
https://www.reuters.com/markets/commodities/china-widens-ren...
They're also massively investing in nuclear https://www.bloomberg.com/news/features/2021-11-02/china-cli...
So, China's reliance on fossil fuels is going to keep decreasing going forward, and that will make it that much easier to fill the gap from friendly countries where US can't interfere.
Finally, it's kind of silly to think that this is a one way street. If US ever did decide to try and blockade China, it's obvious that China would retaliate. We're already seeing this with the whole chip war right now where China has stopped export of Germanium and Gallium. https://www.channelnewsasia.com/business/china-export-curbs-...
Given how dependent US economy is on China, the blowback from any sort of blockade of China would do incredible damage domestically in the US.