AKTAU, KAZAKHSTAN – AUGUST 12: President of Kazakhstan, Nursultan Nazarbayev (C), Iranian President Hassan Rouhani (2nd L), Russian President Vladimir Putin (2nd R), Azerbaijani President Ilham Aliyev (L) and President of Turkmenistan Gurbanguli Berdimuhammedov (R) sign a deal on the legal status of the resource-rich sea during the 5th summit of the leaders of Caspian Sea littoral states in Aktau, Kazakhstan on August 12, 2018