Many Caucasions, Hungarians, Finns, Estonians and others speak Uralic-Altaic languages. The heavy hitters in that group are Turkish and Korean.
Caucasion relates to the presumed geographical "origins" of white folk. Indo-European deals with a family of languages which may or may not share Caucasion "origins".
It's a stretch to put Korean into the Uralic-Altaic family. Finnish and Turkish, for example, are agglutinative, while Korean is not.
I wouldn't agree that Indo-European and Semitic are "closely related." Heck, within the Indo-European family there are languages which are only remotely related...and the "Afro-Asiatic" family which includes the Semitic and Hamitic languages has members which are only distantly related to each other. There are some linguists who claim to have found evidence of a relationship between the Indo-European and Semitic families, but I don't think their views have won wide acceptance--the evidence is just too meager because the relationship (if it exists) is so far back in time.