Increasing interest rates is not going to work too well. The idea behind it, is to slow down borrowing hence slowing down demand and with that lowering inflation. That just does not work, when the government spends a lot of money on say a war. The other way it works is by attracting international investors due to higher profits. Obviously seizing assets from foreign investors is not helping with that either.

The only way Russia can actually lower inflation and continue the war is by using its foreign currency reserves and buying foreign products to increase supply in the market. In the case of Russia the foreign currency reserves is part of the sovereign wealth fund. So look out for that.