Germany is much richer than Russia because their economy adds much more value to raw inputs. Their industry produces much more refined, valuable goods. For example, before the idiotic invasion of Ukraine, Germany imported huge amounts of Russian gas, that was used by industry to created refined, valuable goods.

Also, it is weird that you chose to comment about the German military. First, due to WW2 era agreements, they are severely limited in how they can deploy their military. Japan is similar. Also, Germany spent 50B EUR last year on their military, and that is set to rise by another 10-20B EUR this year with some extra, one-off spending. These are not small numbers!