Tat or Tati is a Southwest Iranian language spoken by about 28,000 people in Azerbaijan, Iran, Dagestan in Russia, and Israel. It is closely related to Persian and Judeo-Tat.
Tat is taught in some primary schools.
Information about Tat
http://en.wikipedia.org/wiki/Tat_language_(Caucasus)
http://www.ethnologue.com/show_language.asp?code=ttt
Other languages written with the Cyrillic alphabet
Avestan, Baluchi, Dari, Gilaki, Juhuri, Kurdish, Mazandarani, Ossetian, Persian, Parthian, Pashto, Shabaki, Tajik, Talysh, Tat, Wakhi, Yaghnobi, Zazaki