Semiconductors, raw materials for manufacturing, capital, ownership stakes.

Russia is now seeing viable businesses shut down in mass because their owners decide to exit the market. Europe can't sever Russia entirely due to energy dependence. Everyone is wondering what will happen when Russian companies go bankrupt, or the harvests from Ukraine and Russia don't materialize.

Is the real question whether it's safe to have any large economic dependencies on a country that you may have a military conflict with in the future? I'm not sure you can easily segment "core" vs. non-core dependencies except by the fraction of the economy they represent.