Syrian opposition groups have rejected a U.N.-brokered peace plan for a political transition in Syria as ambiguous and a waste of time.

A conference in Geneva on Saturday accepted international envoy Kofi Annan’s plan that calls for the creation of a transitional government, but at Russia’s insistence the compromise agreement left the door open to Syria’s President being part of it.

Veteran Syrian opposition figure Haitham Maleh says the agreement was “a waste of time” and pledged on Sunday not to sit with President Bashar Assad or members of his “murderous” regime.

A spokesperson for the Syrian National Council opposition umbrella group, Bassam Kodmani, says the agreement is “ambiguous” and lacks a mechanism or timetable for implementation.

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