The truce has been left on the verge of collapse in recent weeks by fierce fighting over the northern city of Aleppo.
It comes as Saudi Arabia warns the world will not stand by and will remove President Bashar al-Assad by force if necessary.
Fresh bid to salvage Syria truce
Ngoại trưỡng Mỹ và đặc sứ LHQ Source: AAP
The United States and Russia say they're working hard to revive a Syrian ceasefire.
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