Because the world is clambering for Rubles and/or Yuan as reserve currencies to replace the USD.
Good luck with that.
This will spark a war.... won’t ever admit this is why.. but the powers that be will not allow oil off of the dollar without blood.
Well, there’s always the Petro.
Sure, they can pay in Rubles if anyone will take them. How about Confederate dollars too? Maybe East German Marks? The Truks and Iranians are not stupid when it comes to money.