The joint statement came at the end of the Fifth Caspian Sea Littoral States Summit in Aktau, Kazakhstan.
At the summit, President Ilham Aliyev of the Republic of Azerbaijan, President Hassan Rouhani of the Islamic Republic of Iran, President Nursultan Nazarbayev of the Republic of Kazakhstan, President Vladimir Putin of the Russian Federation and Turkmen President Gurbanguly Berdimuhamedow of the Republic of Turkmenistan attended the meeting.
According to Iran President website, at the previous summits of the Caspian Sea Littoral States held in friendly atmosphere with trust and good neighbourliness in Ashgabat (2002), Tehran (2007), Baku (2010) and Astrakhan (2014), the most important issues of cooperation between the five Caspian Sea littoral states were negotiated and important international issues were discussed.