On 10 September 2016 , Russia and U.S. reached a deal on establishing a cease-fire between the Syrian Assad government and a US-supported coalition of so-called ' mainstream Syrian opposition rebel groups ' including umbrella group ' High Negotiations Committee ' ( HNC ) , effective from 12 September , while jointly agreeing to continue attacks on Jabhat Fateh al-Sham ( former al-Nusra Front ) and Islamic State of Iraq and the Levant ( ISIL ) . Russian Foreign Minister Sergei Lavrov said that Russia and U.S. had developed five documents to enable coordination of the fight against Jabhat Fateh al-Sham and ISIL and a revival of Syria 's failed truce in an enhanced form
failed truce
Geneva peace talks on Syria (2016)
U.S.–Russia peace proposals on Syria