Humanitarian access to Syria's besieged areas is "wholly unacceptable", the UN said Friday (August 26th) as it announced that just one aid convoy had completed deliveries this month, AFP reported.

The UN Office for the Co-ordination of Humanitarian Affairs (OCHA) said a convoy with life-saving supplies finished its delivery on Thursday to al-Waer, a besieged area of the district of Homs.

"While we welcome yesterday's convoy, the level of access to besieged areas this month is wholly unacceptable," an OCHA statement said.

The two-part delivery to al-Waer, which began Tuesday and included food and medical items, was "the first full completed" convoy to reach a besieged area in August, OCHA said.

Top UN officials, including envoy Staffan de Mistura, have blasted Syria's warring parties in recent weeks for blocking civilians from accessing aid.

De Mistura joined Friday's meeting in Geneva with US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov, which are expected to centre on the UN's push to restart Syria peace talks.