The eyes of the world are on Syria as a ceasefire agreement continues to hold.
The Syrian government and rebels have signed up to deal brokered by the United States and Russia, despite concerns raised by rebels.
Hours before the ceasefire, Syrian President Bashar Assad said he is determined to recover all areas of the country from terrorist groups.
Around 40 lorries carrying aid for the Aleppo are stuck in no-man's land in Syria, waiting for permission to travel onward as disagreements between warring sides delay their efforts on the third day of the ceasefire.
The two convoys are carrying mainly food and are currently 25 miles from Aleppo.
David Swanson, a spokesperson for the UN Office for the Coordination of Humanitarian Affairs (OCHA) added that another 20 trucks were waiting at the border between Syria and Turkey, "ready to go".
He added that disagreements between the warring sides were blocking aid getting into opposition-held eastern Aleppo.
The Syrian government has said it will reject any aid deliveries to Aleppo which are not coordinated through itself and the UN, particularly from Turkey, which has backed the rebels fighting President Bashar Assad.
Aleppo was the biggest city in Syria before the civil war broke out in 2011. It is now divided with its rebel-held area besieged by government forces.
The UN's special envoy to Syria said that Bashar Assad's government was preventing life-saving deliveries during a national ceasefire.
The US and Russia have agreed on a cessation of fighting in Syria from 12 September and hope Syrian sides resume diplomatic negotiations.