Wikipedia the Free Encyclopedia has included Crimean Tatar language in the list of state languages of Russian republics. The information can be found in the article ‘languages of Russia’.
Although Russian is the only federally official language of the Russian Federation, there are several other officially recognized languages within Russia's various constituencies – the Constitution of Russia only allows the various Republics of Russia to establish official languages other than Russian. The only exception was made when the city of Sevastopol joined the Russian Federation along with the Republic of Crimea, the Wikipedia informs.
Abaza (Karachay-Cherkessia),Adyghe (Adygea),Aghul (Dagestan), Altai (the Altai Republic), Avar (Dagestan), Azerbaijani (Dagestan), Bashkir (Bashkortostan), Buryat (Buryatia), Chechen (Chechnya), Cherkess (Karachay-Cherkessia), Chuvash (Chuvashia), Crimean Tatar (Republic of Crimea), Dargwa (Dagestan), Erzya (Mordovia), Ingush (Ingushetia), Kabardian (Kabardino-Balkaria and Karachay-Cherkessia), Kalmyk (Kalmykia), Karachay-Balkar (Kabardino-Balkaria and Karachay-Cherkessia), Khakas (Khakassia), Komi (Komi Republic), Kumyk (Dagestan), Lak (Dagestan), Lezgi (Dagestan), Mari (Mari El), Moksha (Mordovia), Nogai (Dagestan and Karachay-Cherkessia), Ossetic (North Ossetia–Alania), Rutul (Dagestan), Tabasaran (Dagestan), Tatar (Tatarstan), Tsakhur (Dagestan), Tuvаn (Tuva), Udmurt (Udmurtia), Ukrainian (Republic of Crimea ), Yakut (Sakha Republic)
To recall, Crimea declared independence from Ukraine and signed a treaty to join Russia on March 18. The unification treaty was ratified by the Russian President and Parliament the same week.
Crimean constitution, adopted on April 11, declared Crimean Tatar language official language of Crimea along with Russian and Ukrainian languages.