The ceasefire in Syria "is about to collapse," an official from the opposition said in an interview published Sunday, just days before the resumption of peace talks in Geneva.
"Over the last 10 days we have seen a very serious deterioration and the ceasefire is about to collapse," Bassma Kodmani, a member of the High Negotiations Committee of the Syrian opposition, told Journal du Dimanche, saying "the use of barrel bombs has resumed".
"The US-Russian mission monitoring the ceasefire is powerless," she told the French newspaper.
A fragile ceasefire between Syrian President Bashar Assad's regime forces supported by Russian air strikes and the rebels brokered by the United States and Russia has largely held since February 27.
The truce does not include areas where the Islamic State group and Al-Qaeda's local affiliate Al-Nusra Front are present.
"A blow was dealt to the opposition, for sure," Kodmani admitted, adding Russia had "attacked the supply lines of the brigades of the moderate opposition on the ground until the cessation of hostilities intervened in February".