The international envoy seeking to end Syria's civil war warned today that the failure of the government and rebels to pursue a political solution could lead to the "full collapse of the Syrian state" and threaten world security.
The proposal calls for an open-ended ceasefire and the formation of a transitional government to run the country until elections can be held.
The regime of President Bashar Assad and the rebel groups fighting his forces across the country have so far shown no interest in negotiations.
The rebels' political leadership has called Mr Assad's departure a pre-requisite for any political solution, and it is unlikely that the opposition's National Coalition could even stop rebels on the ground from continuing to fight.
Likewise, it is doubtful senior members of Assad's regime will voluntarily give up power.
The Syrian government has not commented officially on Mr Brahimi's plan, which he has pushed in the past week in meetings with Assad in Damascus, leading Russian officials in Moscow, and yesterday with the head of the Arab League in Egypt.