Because Israel does not have diplomatic relations with none of them, but i'd bet you anything, that should intelectualls from any of these countries wish to go to Israel for academic pursuits they will be issued a visa. They may have a problem, though, returning with an Israel visa in their travel document. Like Ali was not let leave, they may not be let return.
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PM asked for clarification of deputy IDF chief's speech comparing Israel to 1930s Germany (Haaretz)
from the article: Hi Dina, regards from Ali