3 October, Turkic States Cooperation Day: 17 years of the Nakhchivan Agreement

3 October was marked as Turkic States Cooperation Day. The Nakhchivan Agreement, the founding document of the Organization of Turkic States, was signed on 3 October 2009 by Azerbaijan, Kazakhstan, Kyrgyzstan and Türkiye.

Today the members are Azerbaijan, Kazakhstan, Kyrgyzstan, Uzbekistan and Türkiye, with Hungary, Turkmenistan and the Turkish Republic of Northern Cyprus as observers. In its statement for the day, Türkiye's Foreign Ministry noted that the 13th OTS Summit will be held in Türkiye on 29–30 October.

Turkic Atlas was officially launched on this very day, 3 October 2026.