> The military is labor heavy, and production is mostly domestic.
Russia is decades behind in high-tech and has only limited access to western technology in many areas. The country largely lives of selling natural resources. There is a many years ongoing embargo on high-tech in many areas - also from the EU. There is basically limited technological cooperation with Russia in many high-tech sectors right now.
The result is that Russia has only a few somewhat competitive areas in military technology and needs to invest a lot of money into those: Nuclear weapons, rockets, space technology, etc. Selling those weapons helps their industry a bit.
This affects for example how much money they have to deploy even tanks:
https://www.thedrive.com/the-war-zone/22600/russia-cant-affo...
For example they have only a single old aircraft carrier:
https://www.newsweek.com/russia-admiral-kuznetsov-murmansk-f...
https://www.youtube.com/watch?v=NmUpZDb3W0Q
The US OTOH has none or ten whole carrier fleets...
Russia has submarines and a lot of nuclear technology. From time to time an old one sinks. The older ones are rotting somewhere...
https://www.bbc.com/news/world-europe-48897468
That Russia has cheap clothes for their soldiers, or can mass produce tanks for their soldiers does not help them, if they don't have a competitive high-tech industry. Keeping the nuclear weapons (rockets, submarines, launchers, spy satellites, ...) is extremely expensive and where the money goes.
For the West it's much easier to cooperate on technology and weapons.
See the list of carriers: most of them are from US, NATO or allies.
https://en.wikipedia.org/wiki/List_of_aircraft_carriers_in_s...
It's clear that 65 billions USD doesn't buy much on the world market, even though the costs at home are low. The rest of the economy does not support their high-tech needs...
It's not that Russia has no competitive weapons, but the breadth and depth is simply not there. Russia selectively chooses areas where they develop competitive weapons with their more limited resources.
True, the Russians don't reveal the full scale of military costs. But the US does the same:
https://www.thenation.com/article/tom-dispatch-america-defen...