The three-day conference in Riyadh concluded on Thursday. The next international talks on Syria are scheduled for the beginning of 2016.
"During the Vienna meeting [UN Special Envoy for Syria Staffan] de Mistura, not Saudi Arabia was tasked with forming a Syrian opposition delegation. The aim of the Riyadh conference was to hamper the implementation of the plan adopted in Vienna," the minister said.
"Saudi Arabia cannot oversee the political process in Syria as it is a party to the conflict that supports armed groups."
"The Syrian state said over two years ago that it supported a political solution and dialogue. And we have participated in the Geneva conference despite our complaints regarding certain participants, and we have participated in the Moscow talks. Mechanisms are the problem, not the principle of dialogue itself. We are ready for dialogue but in accordance with reached agreements," Haidar added.
Syria has been torn by a civil war since 2011, as government forces have been clashing with opposition factions and extremist groups operating in the country.