And how well is the country doing? So many men dead for nothing. Probably not good in the long term. Even if they "win" the war. What will they have actually gained?
They will then be close to closing one of the defensive gaps that requires them to have a military which will soon be too big to maintain with their future demographic collapse.
Better if you think that spending two brand-new top-notch hospitals a day on war is better than spending it on, random point from a loooong list of points, fixing district heating so people don't freeze in their apartments.
If Russia was traded on the stock market their valuation would be close to negative: Management is ignoring opportunity costs, stuck scalp-deep in the sunken cost fallacy.
Also those GDP numbers tend to use standardised methods based on self-reporting, that kind of stuff can't be trusted in Russia's case it's better to go by what erm investigative economists produce. Extrapolate GDP from cheese consumption based on old cheese popularity scores and whatnot.
It's all on unsustainable borrowing from the future, so it's all an illusion. Even if they win the war, they may not recoup that enough. Putin has gone all in on this.