Cost of living is higher in the US
Technological and industrial level is also higher in the US, expect a military widget manufactured there to be more advanced than one manufactured in a country where production is 10x cheaper.
This is true across all fields, plus the lack of industrialization means it’s more difficult to manufacture.
USA and europe do not lack industrialization.
Why are all of your goods made in China, Vietnam, etc?
Why are they not made in russia? They are made in china because it's cheaper for western companies to produce there and because they can get away with such exploitation. Your goods aren't military assets.