That own system needs participants to be useful for international deals, and USA can extend the same embargo to that new system, so that all financial instituti

That own system needs participants to be useful for international deals, and USA can extend the same embargo to that new system, so that all financial institutions have to choose whether they break the embargo, participate in the Chinese system and be banned from the main USD systems, or pretend that the Chinese system does not exist and keep all their non-Chinese business functioning.