[gkya]

Turkish ü is similar to German umlauted u and the French u. Here the theory that Turkish is part of a big Altaic-Uralic family that may include also Korean, Mongolic and Japanese is taught at schools. IANAL but AFAIK the general view is that Altaic and Uralic are separate, and Korean and Japanese are not Altaic languages.

Note that Uralic-Altaic and the like have been the fruit of an Anatolian Turkish nationalism and tend to speculate for nobilising the language.