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"Kofi Annan has a mandate from the (UN) Secretary General and the Security Council. The Security Council will judge who should implement his (Annan's) proposals, and how," Interfax news agency quoted Lavrov as telling a news conference in Armenia's capital, Yerevan.
The Friends of Syria, a group of Western and Arab nations, said after talks in Istanbul on Sunday that Syrian President Bashar al-Assad did not have an open-ended opportunity to meet his commitments to Annan, who is seeking a ceasefire.