TEHRAN, Sept. 7 (Xinhua) -- Turkish President Recep Tayyip Erdogan arrived in the capital Tehran on Friday to attend a trilateral summit aimed to address crucial issues on Syria.
Russian President Vladimir Putin will also join Erdogan to discuss Syria with their Iranian counterpart.
It would be the third summit within the Astana process which, the three states say, seeks to bring an end to the violence in the seven-year civil war in Syria.
The meeting comes amid escalating tension over an impending military operation by the Syrian army into the rebel-held Idlib province of the war-torn country.
The United Nations worries that the offensive could force 2.5 million people toward the Turkish border.
Prior to the tripartite meeting, Erdogan is scheduled to meet with Iranian President Hassan Rouhani.
