I don't think so.
1. Most of the Russians cannot use the banks/cards much and the rubles are getting worthless: not much of ways nor reasons for selling them bitcoin (why would anybody accept rubles for bitcoin?!)
2. Russian whales have anyway a lot of money stashed outside Russia, probably in EUR, USD, CNY, stocks and so on, probably not (or no longer) under their own names. They can easily buy/sell bitcoin under others' names if they want to.
3. Many countries still want to buy oil and gas from Russia, no matter what. So, in a way or another, the money still flows.
As I said in another place, this "crypto helps Russia against sanctions" is imho an over-hyped unrealistic story.