Sanctions were supposed to have a devastating effect on the Russian economy. Oil and gas production was supposed to drop lower and lower due to the withdrawal of western expertise and specialist equipment. That has not happened, in part because equipment has been ordered by other countries then shipped to Russia. Revenue from oil and gas sales was supposed to be restricted by the price cap imposed by the west. That has happened - Russia has to discount the price to sell to new large customers India and China.
India and China have increased exports to Russia, in part to fill the demand that was previously met by imports from the countries now sanctioning Russia or production of their products in factories in Russia. China and India do not want to be paid for their exports to Russia in rubles. This means that Russian importers are having to sell rubles to buy currency acceptable to Indian and Chinese suppliers.
Sanctions on banks dealing with Russia mean that it is difficult for countries buying from Russia to actually pay for what they are buying. Example: India could not pay Russia for the S-400 SAM system it bought.
The list of problems this war is causing Russia goes on and on. Central bank base rate near 20%, inflation rate near 10%, loss of labour by industry to the army and weapons production meaning other factories cannot be run to their production capacity, production of Russian airliners last year a grand total of zero etc etc