There is mention of the value of the ruble falling.
It increased in value today. The idea seems to be that Russia will use up all of it's reserves propping it up. Pass no idea. If a country is self sufficient enough all it does is reduce the cost of their exports and Russia is a member of some trading blocks or was when I looked a while ago.
Sanctions can do things. Take Iran. The UK and USA owe them money. The USA paid it off a while ago but had to load up crates of gold bars or something or the other and fly the stuff there. No other way to pay them.
The UK's latest idea seems to be to send them £400m worth of medications. At one point it seems we had some come here to settle it in the courts. They were grabbed by immigration and deported as soon as they arrived.