UN-Arab league envoy Kofi Annan is back in the Syrian capital, Damascus, in a bid to salvage his faltering peace plan.
He is will hold more talks with President Bashar al-Assad.
Mr Annan acknowledged on Saturday in comments to Le Monde newspaper that his peace plan has failed to stop the fighting.
Mr Assad says the Annan peace plan is being hindered by countries including Turkey and Saudi Arabia who are providing support for 'terrorists'.
He told a German television programme the plan is being blocked by countless obstacles, but should not be allowed to fail.
Mr Assad accused Saudi Arabia and Qatar of providing weapons to Syrian rebels and Turkey of giving logistical help to smuggle in supplies.
He said the United States had offered political support.