The United States and Russia have failed to agree on how to revive a short-lived ceasefire in Syria during what the UN Syria mediator called a "long, painful, difficult and disappointing" meeting.
The International Syria Support Group met on the sidelines of the annual United Nations gathering of world leaders in New York as the Syrian army announced the start of a new military offensive in the rebel-held east of the city of Aleppo.
"We have exchanged ideas with the Russians and we plan to consult tomorrow" on their ideas, US Secretary of State John Kerry said after the meeting.
"I am no less determined today than I was yesterday but I am even more frustrated."
Russia and the United States agreed on September 9 about a deal aimed at putting Syria's peace process back on track. It included a nationwide truce, improved humanitarian aid access and the possibility of joint military targeting of banned Islamist groups.
But the truce effectively collapsed after one week when an aid convoy was bombed on Monday and some 20 people were killed.
"The good news is that Russia and the US agreed to work intensely on a possible restoration of it," UN Syria mediator Staffan de Mistura told reporters.
"It was a long, painful, difficult and disappointing meeting."
"Meanwhile ... everyone is going back to the conflict. The next few hours, days maximum are crucial for making it or breaking it," de Mistura said.
Kerry demanded on Wednesday that Russia and the Syrian government immediately halt flights over Syrian battle zones.
"We have not succeeded so far, but there was a lot of support around the table for the proposal, a temporary ban for all flights in order to create the conditions for the truce," German Foreign Minister Frank-Walter Steinmeier said.
French Foreign Minister Jean-Marc Ayrault described Russian Foreign Minister Sergei Lavrov's response to the proposal for grounding planes as "not satisfying." He said the meeting was "intense".
Russian Foreign Minister Sergei Lavrov said the Syrian opposition needed to take steps toward a compromise.
However, a senior US State Department official, speaking on condition of anonymity, told reporters: "The ball is very much in the Russians' court to come back to us with some ideas that are serious, that would be above and beyond the types of things they have been willing to agree to in the past with regard to air activities over large parts of Syria."
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