They is primarily Russia and China.
Your missing the point. If the US sanctions a country and demands that other countries sanction them too while the US holds the Reserve currency, they have to, or they are unable to do business with any country which buys and sells in dollars which used to be pretty much everyone, Even when the US broke the JCPOA deal they sanctioned Iran even more for nothing and the EU though claiming they did not want started sanctioning Iran again as well. You will remember that. This likely has ended the JCPOA as Trump wanted.
I will give you a quote then and see if what it says about it is more understandable. If the dollar stops being the reserve currency, it will lose these advantages.
One infallible trend that has persisted throughout history is the correlation between financial and geopolitical power. For a country to build up its military, pursue innovative technologies, and maintain a productive workforce, it must have a robust economic base. While admirals and advisers...
nationalinterest.org
Yes, I had a similar attitude to you towards it for many years and for that reason I did not study economics as part of my degree. It is something I have really regretted. I have learnt a little while on line but wish I knew more.
