Azerbaijan–Turkey relations have always been strong with the two often being described as "one nation with two states" by the ex-president of Azerbaijan Heydar Aliyev due to both being Turkic nations. Turkey was the first state to recognise Azerbaijan's independence in 1991 and has been a staunch supporter of Azerbaijan in its efforts to consolidate its independence, preserve its territorial integrity and realize its economic potential arising from the rich natural resources of the Caspian Sea. The countries share a short 8 km border, with the Aras River separating Turkey from the Nakhchivan exclave.