The UN Security Council on Friday canceled an urgent meeting that had been called to discuss a US-Russian deal on Syria, at the request of both the United States and Russia, diplomats said.
During the scheduled meeting, US and Russian envoys were to present details of the joint agreement that calls for a ceasefire, the delivery of aid and joint targeting of Islamist rebels in Syria.
Russia, Syria's key ally, is pushing for the Security Council to endorse the agreement, but France and other council members have said they must first learn more details about the deal.
Under the deal, all sides were due to allow deliveries of food and other basic supplies to the battleground city of Aleppo after a ceasefire went into effect on Monday.
But on Friday, aid convoys positioned at the border with Turkey had yet to receive the all-clear to begin their journey to Aleppo.
Russian Ambassador Vitaly Churkin said Thursday that the council could adopt a resolution backing the agreement during a high-level meeting on Syria to be held on Wednesday.
US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov are due to attend the council talks, held on the sidelines of the UN General Assembly meeting.