Russia is heavily invested in Iran's nuclear programme, including removing spent fuel as part of the original 2015 nuclear agreement.
Middle East stock markets continued to bleed losses at the start of trading on April 7, as the effects of US tariffs on numerous countries persist.
Threat to bomb Iran over its nuclear programme also on agenda.
The Arab League's Ahmed Aboul Gheit has hit out at Israeli strikes on Gaza on March 18 in a sign of collapsing relations between the two sides.
The Gulf Cooperation Council (GCC) states are increasingly backing Russia in its geopolitical and economic standoff with the West, but they have stopped short of fully embracing Russia.