Russia is backing it up with Gold. Gold is accepted everywhere in the world, this makes the Ruble stable.
Edit: Watch this video for more info: https://www.youtube.com/watch?v=6SjvimH42po
Edit: Watch this video for more info: https://www.youtube.com/watch?v=6SjvimH42po
[1]Turkish-Iranian gold trader's ‘Beautiful Mind’ testimony drove U.S. sanctions case:
https://finance.yahoo.com/news/gas-gold-turkey-iran-scheme-e...