The United States and Russia have failed to reach a deal to ease fighting in Syria.

A senior official from the U.S. State Department said a fresh round of talks between U.S. Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov on the margins of the G20 summit in Hangzhou ended without agreement.

A deal to provide aid to Aleppo’s ravaged civilians and at least partially halt Russian and Syrian bombardments had looked likely on Sunday.