I don't know how easy can the Russians buy Bitcoin nowadays if their money is locked is a bank, it may not be easy to withdraw and find a Bitcoin seller, and the fiat value decreases by the hour.
But I may be wrong, since there are also banks not banned from SWIFT which still operate in Russia.
I wouldn't say that the ruble's value decreases by the hour currently, after it sharply fell by more than thirty percent, it remains relatively stable. However, prices of goods may grow way faster than the exchange rate of the ruble, so its purchasing power will naturally decrease significantly. In the times like that, you understand the hard way how terrible fiat money is at holding its value.
Actually Monday, after the initial shock, it has recovered (I don't know though if it was natural or it was a massive intervention of the central bank), but Tuesday was again on a losing trend.
You can see the chart here for EUR-RUB (so increase means RUR losing value) :
https://www.investing.com/currencies/eur-rub-chartAbout the price of the goods and services I do agree with you. Those show much more accurately the inflation, those prices cannot be manipulated so easy by the central bank.
100000 rubles could buy Russian people 0.031 BTC just several days ago, but now you can buy only 0.023, which also means that people, who have had bitcoin on hand before the invasion started, witness their savings in ruble terms grow by more than 30%. Truly, bitcoin is a perfect savings technology that helps innocent people to overcome economic and political hardship like that. However, not all Russian people understand how important bitcoin is, that is why the demand for bitcoin is far less than it could be. That means that now you can buy bitcoins in Russia with no fuss or muss using any existing P2P-exchange like HodlHodl or, for example, exchangers presented on Bestchange. Paradoxically, people are still ready to exchange the hardest form of money people have ever had for useless fiat that quickly loses its value!
Converting a currency hit by heavy inflation into
anything that doesn't fall is already a leap forward. Bitcoin has its history of wide price variation, hence buying Bitcoin is a bit risky - let's be honest - especially if one doesn't want (or cannot) hold for many years. So I cannot call it perfect yet. Right now Bitcoin took the path of store-of-value assets and its price grows, making it a very good deal for those believing it from start.
But those hit by this war will have to take decisions in a hurry and I won't blame them if they don't choose Bitcoin
this time. I could blame them though for not buying Bitcoin in the past months or years.
Still, as I wrote in another place: Bitcoin is the easiest way to carry your money/savings/wealth when you flee.