Since the nixon shock (1971) and petrodollar deal with the saudis (1974) if you need oil, and every country on earth does, you need dollars first, which means every country has to maintain dollar reserves, which means demand for dollars is structurally guaranteed not by gold or treaty, but by energy. You can't buy energy without dollars. You can't run your economy without dollars. The US has made itself the global tollbooth. The US gets to print dollars, spend them on goods (for treatlers), military (for defending treatlerism), debt (to actual workers), export them to the non-burger world (as inflation), and the world is forced to absorb them, because the alternative (not having energy) is worse. It's a global tax that every other country pays to the US treatler reich. There are two camps: Capital and Labor. This is Capital vs. Labor, but on a planetary scale. The US is capital. It made everyone else labor. Iran is destroying that. Praise Iran. Thank Iran.
Prices of oil are global. If oil prices stabilize (because of trading in Chinese Yuan) then also the petrodollar stabilizes. If the great mullahs had read Marx, they'd know, that for them to win against Ami, they have to collapse global capitalism. They, of course, will not do that, being that they are Kantian idealists, ideologically speaking.