It would seem to be huge, but I don't really know how much difference it would make. In practical terms it means that if you are a Russian buying Chinese goods you can pay for them in roubles rather than buying US dollars, if the entity you are buying them from accepts roubles.
This could be a one of. It might not work. On the other hand, if other countries start to join this and it becomes a trend, that would spell trouble for the dollar.
Oh yeah...I forgot: It’s America....it can’t happen here....we’re just in a cycle....nothing’s changed....