This is much, much, much bigger than most people realise as “customers” simply cannot just hand over Dollars, Pounds, Euros, and Yen to “buy” Rubles because the sanctions prevent Russian banks from processing payments (and even if they could process the payments the funds would simply be frozen / confiscated on first attempt to spend them).
The “customers” will have to go through another clearing system, such as the Chinese system, or exchange thier Gold or commodities for hard cash in the form of Yuan, to be exchanged for Rubles.
This is a real “Financial Tactical Nuke” strike against the western banks and currency units.
