"The resolution that is on the table, we are ready to look at it, but we have offered very precise phrasing that would say that the ceasefire would under no circumstances extend to ISIL, Jabhat al-Nusra and those groups cooperating with them and systemically attacking the residential neighborhoods of Damascus", Lavrov said.
Ja'afari said his government interpreted the resolution as also applying to "Turkish forces in Afrin, and the operations of the anti-ISIL (Islamic State) coalition in Syria. We are used to their betrayals", he added.
Syria's former Al-Qaeda affiliate is present in Eastern Ghouta and Assad's regime routinely describes all of its opponents as "terrorists".
A group of doctors and medical activists, from institutions including Harvard and Johns Hopkins, published an appeal on Friday to end the suffering in Ghouta.
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The United Nations Security Council (UNSC) passed a resolution on Saturday night calling for an immediate 30-day ceasefire in Syria to evacuate civilians and allow for food and medicine in to the enclave.
Russian Federation did not want to specify when a truce would start, so a proposal for the truce to begin 72 hours after adoption was watered-down to demand it start "without delay".
The resolution demanding the ceasefire "without delay" was adopted as Syrian government forces pounded the rebel-held enclave of Eastern Ghouta, where hundreds have died during a week-long assault. Instead of "scaling-up rhetoric against Russian Federation", he called for the US-backed coalition to promptly end its "occupation" which would improve the humanitarian situation in Syria's north and east.
In Ankara, Turkish Deputy Prime Minister Bekir Bozdag said the United Nations resolution would not affect Turkey's offensive against Kurdish fighters in Syria's Kurdish-held Afrin region.
"I am deeply saddened by the awful suffering of the civilian population in Eastern Ghouta - 400,000 people that live in hell on earth", he said to the U.N. Security Council on Wednesday.
The cornered rebels in Eastern Ghouta have been firing back into Damascus, where six civilians were wounded on Saturday, state media said.
The calm came after a week of intense airstrikes and shelling that killed more than 500 people in eastern Ghouta and left dozens dead or wounded in the government-held Damascus, which rebels pelted with mortar shells.