> most manufacturers of everything within Ukraine remain dependent on imported machining tools — traditionally Chinese, but increasingly Indian and, for those who can afford it, European.

But for the cheapest components, simple base-line products like transistors, circuit boards, wiring, or solar cells, nobody can yet step up to the scale of China’s mass production.

For example, the BC-348 receiver, widely used in aircraft, was produced initially by RCA, and eventually "farmed out" to 3 other manufacturers.

More than 4 million M1903 Springfield Rifle were produced by the Smith-Corona typewriter company.

Here's a really good example, look at how the production of proximity fuzes, was distributed.[1]

The key thing is to have second sources for everything. Something the US military seems to have forgotten, or decided to ignore in their pursuit of gold-plated weapons systems that give the most kick-backs.

[1] https://usautoindustryworldwartwo.com/vtproximityfuze.htm