Syrian air strikes - backed by Russia - have made the rebel-held enclave of Eastern Ghouta "hell on earth". Around 1100 civilians have been killed, including hundreds of women and children, during more than three weeks of bombardment.
The United States wants an immediate ceasefire and wants the backing of the United Nations Security Council. If it doesn’t get it, the US says it is prepared to take its own action. And that could draw it further into a war that also involves Russia and Iran.
So who can enforce a new ceasefire and could Washington go it alone?
Vyacheeslav Matuzov, former Russian diplomat
Chris Doyle, director of the Council for Arab-British Understanding.
Hassan Yari, professor of international relations and security issues at Sultan Qaboos University, Oman.
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