Contrast the present situation with the cold war. The society union may have sometimes gotten western parts which theyd use for various purposes - most famously tractor factory equipment and Mainframes. The same was true for us acquisition of titanium. However the idea that either military would rely on the other blocks parts would have been insane. Trade was not normalized, and tracking the majority of shipments between the blocks was a tractable problem. These jelly bean parts have huge supply chains that just happen to be extremely efficient.

I wonder how close we are to a world where global conflict becomes impractical simply due to a lack of parts.