Using the value of the ruble is not a very accurate measure of the strength of the economy. The ruble is not widely used and value is easily manipulated. With that said the central bank of Russia has done about all they can to support and stabilize
I recommend looking up on YouTube a site called joe bloggs, he covers economics pretty well and has some good stuff
Russias spending on defense has been a fraction of the US for many reasons, but when you look at their budget 65 billion is a very large number
Lastly consider the source, is Russia telling the truth and considering their economic abilities and needs what does this say for their future. Russia began the war with a huge soviet legacy in equipment and supplies. They have done a pretty good job blowing through that. Replacing or rebuilding will be a challenging prospect
My 2 cents
Look, you ask me to “consider the source”...and I am hearing two different groups of sources each with pom-poms chanting for one side or another. So I look at the value of the Rubble. I have no illusion that it tells me the entire story of the Russian economy, and I do know that Central banks always manipulate their fiat currency. This happens for every country. Countries that are falling apart however have their currencies collapse and their central banks are helpless to stop it. I note this is not the case with Russia, at least not yet. Not because I think I know everything that can be said, but because I don’t have any better info than what I can get myself and I know something about forex markets.