WeeklyCaspian rich in oil and diplomacyAgreement: Iranian President Hassan Rouhani, Azeri President Ilham Aliyev, Kazakh President Nursultan Nazarbayev, Russian President Vladimir Putin and Turkmen President Kurbanguly Berdymukhamedov walk on the embankment of the Caspian Sea following the Caspian Summit in Aktau this weekEditorial