tl;dr: Intel and AMD are not selling their processors to Russia, and processors from Russian companies cannot be manufactured as Taiwan is banning TSMC from doing so, while Russia can only produce chips up to a 90 nm process.
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The article mentioned Russia’s domestic production. It said their domestic factories can only produce 90nm chips, which is believable.
As far as the latter part of what you said is concerned, that was my same takeaway. China proper is the second most advanced manufacturer of transistors and has good trade relations with Russia; to the extent that their earlier declaration of friendship read more like a marriage declaration. These western sanctions only amount to Chinese protectionism. Its a huge boon to Chinese and Russian technological development and cooperation.