Total population: RU=140M, EU=370M
Population available for mil: RU=70M, EU=170M
Present active mil: RU=1.3M, EU=1M
Reserve: RU=2M, EU=1.4M
Paramil: RU=250k, EU=380k
Combat Aircrafts: RU=4k, EU=4k
Tanks: RU=5.7k, EU=2k
Armored Vhc: RU=130k, EU=340k
Artillery: RU=16k, EU=2k
Large combat vessels: RU=100, EU=80
Subs: RU=60, EU=40
The economics is more hairy to compare directly because there are so many parameters. The most stringent ones seems to be that RU has a lot of fiul, gaz and coal and an industrial network spread accross a vast land that's not easy to target, and of course a seemingly good relationship with China. Apart from that, I don't think the EU is partcularly weak as far as finance and manufacturing are concerned.Looking at those numbers, I do not believe that the sentiment that "Russia is going to invade the EU unless massive expenses in weaponry" holds a lot of water.
The tremendous amount of efforts and finance that's been thrown at the military during the cold war was not aimed at invading the other side.
I would even add that spending that much on the military is probably what the strategists in the Kremlin are hopping EU will do. After all, if they know the history of their own country, they must know what caused the fatal financial crisis that brought down the USSR in the 80s.