Iranian President Hassan Rouhani landed in the north-western Kazakh city of Aktau on Sunday, ahead of the 5th Caspian Summit between the five Caspian states: Russia, Azerbaijan, Kazakhstan, Turkmenistan and Iran. President of Azerbaijan Ilham Aliyev, President of Kazakhstan Nursultan Nazarbayev, President of Russia Vladimir Putin and President of Turkmenistan Gurbanguly Berdimuhamedov are to... Еще take part as well. A convention on the Legal Status of the Caspian Sea is to be signed at the summit. According to the Kremlin, the five countries have been working on an agreement since 1996. The convention is to mark the legal status of the contested Caspian Sea.