The US controls Venezuelan oil and has blockaded Iranian oil.
The US has blockaded the Strait of Hormuz. About 50% of China's oil came through this strait.
The US has established a security agreement with the Indonesia. About 80% of China's oil travels through Indonesian Straits.
The US has eliminated the cheap oil to China from Iran and Venezuela.
The US controls the shipping lanes for about 80% of China's oil supplies.
These actions weakens the BRICS.
The world runs on oil. Control of the majority of the world's oil supply ensures oil is purchased with US dollars.
The petrodollar insures dominance of the US dollar as the world's reserve currency.

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