The 6th Indian Ocean Naval Symposium (IONS) was held at Iranian capital Tehran on April 22-25,2018.
In addition to the IONS member states, some countries like the Caspian Sea littoral states also took part in this event.
During the international event, the Iranian Navy took over the presidency of the IONS for two years.
The IONS is a voluntary initiative that seeks to increase maritime co-operation among navies of the littoral states of the Indian Ocean Region by providing an open and inclusive forum for discussion of regionally relevant maritime issues.