Per Newsweek there is a lot going on in Congress as regards sanctions, secondary sanctions etc.
https://www.newsweek.com/white-house-explains-why-russia-not-included-trumps-new-tariffs-2054548
Full list in this article
https://www.newsweek.com/trump-reciprocal-tariff-chart-2054514
South Africa is on the list. Some heavily sanctioned countries are excluded (Cuba, North Korea, Russia). Iran is included.
It will be interesting how this list shakes out over time. I try to avoid the non wrestling forum category but tariff reciprocity has pros and cons, upsides and downsides, economic and political ramifications of interest.