Not that simple.
Ruski builts 10 tanks on price you build one, hire 100 soldiers on price you hire 20 etc.
Plus they don't fight decade-long wars on the other side of the world. They fight quick and effective to keep the price in check. HUUUUge difference.
OK, US ain't bad in everything. One thing where they beat Ruski and make me say "america - fuk yeah" is this... it's cool

