Moscow is also urging Washington to distinguish between extremists and the Syrian opposition, Lavrov added.
“To make the ceasefire work and make it inclusive, our partners must do everything possible to remove the moderate opposition, which relies on foreign support, from the positions occupied by the terrorists.”
Lavrov also called for an extended ceasefire in Syria. “Of course, there are separate groups who would like to undermine the cessation of hostilities, to provoke an escalation [of the crisis]. We can’t let them do it,” he said.
Lavrov also warned against any calls for a ground operation in Syria.
“Russia is concerned, and not just us alone, about Turkey’s shelling of the Syrian territory, continued creation of certain security zones in Syria, not to mention the increasing calls for a ground operation.”
Moscow is convinced “that such calls come from those who are not interested in the real political settlement [of Syrian crisis] and who rely on a military solution.”
“We are convinced that this is the way to a catastrophic situation, and such appeals should be stopped,” Lavrov said.
In April, the Geneva peace talks were gridlocked after the Saudi-backed Syrian opposition withdrew from the negotiations, citing the deteriorating situation in Aleppo.
Acknowledging the increasingly shaky state of the ceasefire in Syria, de Mistura then expressed hope that Russia and the US could breathe new impetus into the process, halting the fighting on the ground and solidifying the political transition process.
On Monday, the Free Syrian Army refused to recognize partial ceasefires or local lulls in violence, claiming that if the UN-backed truce was not implemented in full, the group would reserve its right to withdraw from the Geneva talks and respond to any attacks.
WarSclerotic 
May 3, 2016 at 4:06 PM
Dozens of casualties in rebel rocket attack on Aleppo hospital – state media (VIDEO)
Dozens of people have been killed and injured in a rocket attack on a hospital in the contested Syrian city of Aleppo, state media reported.
The hospital, which was under the control of government forces, was targeted by a radical rebel group, Syrian state TV reported. The facility is said to be ruined after the attack.
https://youtu.be/4O9uNigWeBw
Last week, another hospital in Aleppo was targeted by an airstrike, which was blamed on the government forces. The Syrian government denied the accusation, however.
READ MORE: 14 killed in hospital strike in Syria’s Aleppo while UN’s de Mistura urges to protect ceasefire
The Syrian army said it was responding to the attack with “appropriate measures.”
Aleppo, one of Syria’s largest cities, remains a hotspot, with different parts of the city held by various groups. The Islamist Al Nusra Front, which does not observe the US and Russia-negotiated ceasefire, is accused of staging attacks on both government forces and rebel groups to derail the truce.
https://www.rt.com/news/341665-attack-hospital-aleppo-casualties/