I have the memory that ruble and yuan would not be issued through debt issuance but as "pure paper" like Finnish Markka used to be some decades ago.
JFK got killed after proposing that the U.S. moved to debt-free U.S. Notes and scrapped FED-currency.
Yes! executive order 11110, resulting in over 4 billion worth of $1 denominated silver certificates. I heard of that with great interest also. Regarding the Chinese Yuan article, I misread the headline: actually their currency only devalued in the last 7 days, but is up slightly over the longer term against the dollar.