Russia is good at some things and bad at other things. The S-400 missiles use a SPARC-derived CPU designed by Elbrus but made by TSMC in Taiwan. Russia is world-beating in nuclear, they are the only people who build LWRs on an n-th of a kind (NOAK) basis and have a working fast reactor that is quite a beautiful machine with no drama. They will build a reactor in your country, supply fuel and then take it away.