Iran’s oil industry has been under sanctions since Donald Trump’s first term. Since then, Iran has seen its pool of buyers shrink to leave only China—but China has been a big enough buyer to not only keep Iran’s oil industry afloat, but help it grow, at least in terms of production. In terms of revenues, perhaps not so much. One big reason why Iran was able to boost its crude oil production to levels from before the first Trump administration began imposing sanctions on it, was China. China’s insatiable appetite for…