Restrictions on humanitarian convoys imposed by Syria's government have frustrated efforts to deliver life-saving aid to besieged people in the war-ravaged country, UN envoy Staffan de Mistura said Thursday.
A 17-country United Nations panel, co-chaired by the United States and Russia, has been working since February to boost aid deliveries to an estimated 450,000 Syrians stranded in besieged areas, as well as 4 million others in places the UN describes as hard-to-reach.
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