"The Free Syrian Army has never cooperated with extremists, and among the representatives of 'opposition' delegations in Riyadh a committee was chosen that is closely connected with the Muslim Brotherhood," said Al-Awak.
"Terrorists will never be allowed to present themselves as moderate opposition and formulate the future of Syria and the region," said Amir-Abdollahian on Thursday, and warned against "sideline talks" outside of the framework of the agreements reached in Vienna last month.
Saudi Arabia invited 116 members of political and militant opposition groups from Syria to Riyadh in order to try and unite some of them. Among those not invited were the Kurdish Democratic Union Party (PYD) and its armed force, the YPG, which controls large parts of northern Syria. The Kurds held their own meeting in the northeastern Syrian province of Hasakah.