This is not accurate. They have no "ability" at all. The only Iranian crude (about 140 million barrels) allowed to be sold was already loaded onto tankers before the war. (1)
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Not all countries, but India, Japan, South Korea, and Singapore could buy this medium-sour grade oil. The U.S. had to allow it.

China blocked its oil exports to worsen market conditions.(The latter information you withdrew from your audience).

(the end)
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