I read a good article about all this in The Economist a few weeks ago. I don't remember all the details, but the long and short is:

• sanctions/cutoffs for oil & gas haven't hurt because of higher prices, Russia is bringing in more revenue
• but I think more countries are going to stop taking Russian oil, and their total export earnings may fall on that
• some things will take a bit longer to bite, but will bite hard; example = can't get replacement parts for airplanes, will gradually grind Aeroflot to a near halt