The Prez explicitly did not communicate anything about “cultural heritage sites”.
These statements were very carefully worded.
Since the late 1990’s, the Russians have worked to build Iran’s nuclear capability, and have shared farely late gen cbrn technology. The conduit by which this has largely been done was through forced or voluntary collaboration of many Iranian cbrn related university professors. The controlled labs and production of the Iranian cbrn development is often within Iranian universities, and proximal cbrn weapons productiin facilities.
Iran has intentionally identified many of these modern universities and adjacent or proximal cbrn development sites as “Cultural Sites”.
As well, there are many Russian technicians and engineers who live, work, and have even collaboratively developed new cbrn weapon systems within Iran.
Additionally, many of these sites have adjacent large modern or famous mosques.
Some of these have been constructed on top of, or adjacent to cbrn and specific nuclear sites.
Cultural sites to include refineries and chem plants.
Because of *on the ground Russian cbrn r&d and engineering presence at these “cultural sites”, and because Iran is literally a “loose cannon” (Moscow cannot fully predict), Trump’s messaging should be taken by Russian nationals in Iran as a possible “GET OUT OF DODGE” warning.