"This is an international meeting, its terms are still unknown… There are actually two paths: the first is the talks between Iran, Turkey, Russia, joined now by the fourth part, Kazakhstan," Vitaly Naumkin told RIA Novosti.
He stressed that it was unknown whether the meeting would be trilateral or quadrilateral, whether it would be held at the level of foreign ministers or heads of state.
"The second [path] is the negotiations between the Syrian government and the opposition. There is a very important, key issue, regarding whether… it would be able to form a single delegation of the opposition. It has always been the most difficult aspect," Naumkin said.
Kazakh President Nursultan Nazarbayev supported the initiative and expressed readiness to provide a platform for such talks in the Kazakh capital.
Earlier on Thursday, Russian Foreign Minister Sergey Lavrov said Russia launched the groundwork for talks between the Syrian government and opposition in Kazakhstan alongside Turkey and Iran.