The attendance of the Iranian President at a regional security summit in Russia has been delayed amid the mass protests in his country.
The Shanghai Cooperation Organisation is taking place in the Urals city of Yekaterinburg, and Iran normally has observer status at the meeting.
The leaders of half a dozen countries gather to discuss security concerns they share. A meeting of the group in 2006 was dominated by controversy over Iran’s nuclear programme.
The leaders of India and Pakistan are due to meet on the sidelines of the summit, their first such meeting since last November’s terrorist attacks on Mumbai.