Russia has led the BRICS proposal to use its own currency rather than USD for trade. Russia now settles most of its trade payments via Chinese channels outside of the USD/SWIFT/BIS network controlled by America. Trump has previously threatened BRICS nations (led by Russia on this matter) that if they stop using the USD/SWIFT he will sanction them and punish them harshly- well Russia has already been sanctioned and excluded from SWIFT. So clearly Trump wants Russia back using the USD rather than Chinese trade settlement alternative that Russia has been using. Iran (another BRICS member already and for many years uses and is reliant upon Chinese trade settlement routes. Trump is afraid if more nations move to the Chinese trade payments alternative the USD and USA ~ will be fucked. And hes not wrong.