Nonetheless, it does add a lot of friction that slowly grinds away at the economy.
For example:
https://www.reuters.com/markets/commodities/russias-arctic-l...
https://www.reuters.com/business/aerospace-defense/russia-sp...
Russia can't sustain autarky on their own, and especially not with their demographics, manpower shortages due to the war, wartime spending, and corruption. Right now they're coasting on what's left of their reserves, but those are finite. Their economy won't outright collapse but it will get more and more inefficient and fragile.