This seems to be more than just a manufacturing problem and is indicative of a design problem. I’ve heard rumors that Russia has a manufacturing line for a 180nm equivalent process ~ year 2000 state-of-the-art.This article might explain the lack of targetting pods and PGM's in the VKS. Russia has almost a complete lack of ability to produce micro electronics. The extent that Russian weapons are reliant on foreign electronic components is much larger than previously thought. Mindful of the fact that the source for this is Ukraine and NATO countries you do need to take some of the things said in the article with a pinch of salt. But the truth may not be that far off.
As for salvaging appliances, Western automakers have been doing the same lately due to the widespread chip shortage.