“My!” said Little Red Riding Hood, “whatever do you need so many tanks for?”
They are a giant land country that has experienced numerous European invasions and has very little coastline. Their lines of communication are mostly internal so they have no need for a power projecting navy like ours. So the Russians need tanks, a massive SAM threat, and a retaliatory ICBM threat.
We on the other hand trade in far flung places, and project power all over the world in our “world police” role. (whatever one thinks about whether or not we should have that role)
So we build the most powerful navy on earth, and an Air Force designed on power projection and dominance somewhere else with almost no focus on home defense.
Horses for courses Riding Hood. Its the same reason we will never build that many tanks.