Ukraine

It's kind of already crashing:
https://www.google.com/finance/quote/RUB-USD?window=5Y
The Ruble came under stress immediately after Russia invaded Ukraine back in February 22nd 2022.
As you can see there a steep drop below 1 cent, then Russia takes a number of immediate actions to support the Ruble, and the value increased to 1.84 cent.
All these actions they took in early 2022 are still in force, yet the Ruble continues to decline, and in a little over 2 years, it has almost halved in value, despite Russian efforts to support it.
If you look at the past 3 months on the graph, you can see a very obvious decline, even when the Central Bank increased Interest rates significantly 3 times from 16% to 21%.
The Ruble is weak, and the hikes in interest rates that should stabilize it, are not effective and are undermined by the Russian economy simply being awful, and Putin becoming economically irresponsible.
By comparison most western Central/National banks have lowered interest rates, for instance the European Central Bank has lowered rates 3 times this year to now 3.4%:
https://tradingeconomics.com/euro-area/interest-rate
Russia is unable to control inflation and currency rates, in an environment where the economies surrounding them are stable. So this is exclusively a Russian problem the imposed on themselves.

Sorry for rambling. 😋