Is this about CPUs or all electronics?

Computer chips are in general a reliable hardware, and top-of-the-line CPUs are in general way more powerful than needed, so there is no need for cutting-edge manufacturing and also an embargo won't halt existing activities.

Simpler/embedded processors seem to be a generic product that can be manufactured by many countries, hindering embargo efforts.

Are chips more critical for a country than e.g. food? because many countries are not nutritionally self-sufficient.