any country’s economy tends to do well during wartime???

I think that's a big ol' Citation Needed

https://forward.com/opinion/603124/israel-economy-iran-retaliation/

israel, for example, doesn't seem to be doing super hot. Nor is ukraine, for obvious reasons.

The economic situation during wartime isn't just inherently better and buoyed by war and destruction, but is often boosted by a wartime willingness to diverge from the capitalist economist orthodoxy and spent state money to keep production going. Russia also has a lot of domestic production and natural resources that are more resilient to sanctions-based attacks than say, high finance, tech industry, anything dependent on foreign capital, etc.

Whether that will change after the war ends depends on the same sorts of economic policies, though the contours will shift a little. The US after WW2 for example, didn't collapse after the wartime economy went away. There's a lot of reasons for that, and its not a perfect analogy, but still, they used economic tools at their disposal to keep the good economy going for a long time after the war.