A World Health Organization official says 70 percent of the supplies loaded on its trucks were removed by Bashar al Assad's regime forces during inspection.
The UNSC meeting comes as civilians in Syria's eastern Ghouta shunned Russia's offer to quit the besieged enclave for a second day, as opposition forces and Moscow blamed each other for the humanitarian deadlock.
The regime forces targeted a number of opposition-held areas, including besieged Damascus suburb eastern Ghouta with air strikes and artillery fire, killing several civilians, a war monitor and a civil defence agency said on Sunday.
A Britain-based war monitor says the death toll may rise as dozens are also injured in the area controlled by rebel forces.
The humanitarian crisis in eastern Ghouta has reached alarming proportions. Residents suffer under a relentless and reckless bombing campaign carried out by Russia and the Syrian regime.
A fourth consecutive day of heavy regime bombing raids on the rebel-held enclave of Eastern Ghouta near Damascus has also left more than 100 civilians injured on Thursday, according to the White Helmets.
Deadliest of the raids hit Hammuriyeh district in the opposition enclave of Eastern Ghouta which remains the target of near-daily regime air strikes since November 14.
Trapped in Syria's besieged eastern Ghouta, both Anas and Mahrous were younger than 20 years of age when they started running to air strike-hit areas to document war atrocities and to take care of their families.
The pair are giving the world a rare look at the realities of life in a war zone. Eastern Ghouta is a rebel-held area near Damascus which is under seige and bombardment by the Assad regime.
UN humanitarian adviser Jan Egeland says the conflict in Syria is returning to its "bleakest days" as the people trapped in the Damascus suburb of Eastern Ghouta face mass starvation.
Britain-based monitoring organisation says the regime shelled besieged Eastern Ghouta district of Damascus, killing seven civilians including two children. It added that retaliatory shelling by rebels later killed three in the centre of the city.
The suicide attacker targeted the Palace of Justice, a court house in central Damascus.
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