“We have worked with Russia and Iran during Astana talks. We are calling for Saudi Arabia and United States to take part in those talks,” Erdogan said in an interview with Portuguese broadcaster RTP late on Thursday.
The Astana talks have brought representatives from the government in Damascus and opposition groups to the negotiating table in a bid to bring an end to the foreign-backed militancy in Syria, which broke out in March 2011.
Four rounds of the negotiations took place on January 23-24, February 15-16, March 14-15 and May 3-4. A fifth round was expected to be held on June 12-13, but has been postponed.
Acting Assistant US Secretary of State Stuart E. Jones and US Ambassador to Kazakhstan George A. Krol were among the US officials, who took part in the Astana discussions.