"likely knowledge of selling to the rival nation despite the current laws."

Well, USA is selling Russia a lot of "dual-use components", including Texas Instruments chips found in drones and nobody makes a lot of fuss about that, even though, in theory, there are imposed sanctions on Russia because it started a war, keeps pushing hybrid war against USA NATO allies.

So, selling graphic cards does not sound like a big deal, especially given the fact that China, likewise Russia, North Korea or Iran can purchase anything through the fake companies place in Ireland, the Netherlands or any other tax paradise where nobody ask too many questions.

This is easy peasy now, in the globalized economy, more, it was always easy peasy, even during the middle of cold war and CoCom times, communistic countries could buy anything they wanted, e.g. communistic Poland had a net of companies in Brazil through which is smuggled whatever it wanted to purchase.