Never heard of "parallel import" via countries like Kazakhstan and Belarus? North Korea is also under sanctions for years, how do they produce anything, including nuclear weapons?And yet the Russians can make fighter, SAM, and naval radars just fine. For whatever reason this indispensable unavailable Western technology is only needed for the A-100 radar complex.
The truth is any such components were removed from Russian weapon systems since 2014 after the sanctions on weapons exports to Russia. The A-100 was developed after the sanctions, so where did they get the military grade electronics for it then?