[capableweb]

Many "countries" don't do business in USD, they do business in their own currency. Why haven't those countries already been invaded if what you're saying is true?

[bombolo]

Can they buy oil with their own currency? No, they have to use their currency to buy USD and then buy oil.

If they get a deal with an oil selling country that says otherwise, USA sends in the army (usually to the seller, not the buyer).

[stonogo]

India is buying oil in rubles right now. Let me know when the US invades.