The hidden thing here is that, Russia has just one export : energy. If Europe decided that they are no longer working with Russia, even in the face of economic collapse, then it means that Russia will eventually grow smaller and smaller and will have money problems for sure. Plus, there has been so many Russian oligarchs who lost their assets and money at the same time as well, all taken from them.
This doesn't mean that economic data shows Russia doing badly right now, you are %100 right that they are doing much better after the war, but this is mainly due to everyone slowly getting away hence making the price increase and why making Russia a short term profit. Do you really see nations getting any energy from Russia 10 years later? Of course not, then what will Russia sell to keep this economy?
On top of oil, gas and coal, Russia is also one of the top exporters of wheat, potash fertilizer, nuclear fuel, defense equipment and various metals. And right now they are earning much more from their exports compared to the case last year, because of higher prices. If the NATO want to hurt Russia, there is only one way to do that. It is to bring down the energy prices (the policy that was implemented by Regan during the late 1980s). But Biden's stupid policies means that the oil and gas prices are further driven up.