UNITED NATIONS - Russia circulated among UN Security Council members on Tuesday a draft resolution to extend a UN mission in Syria for three months so it can shift focus from monitoring a non-existent truce to securing a political solution to the conflict.

The deeply divided council must decide the future of the mission, known as UNSMIS, before July 20 when its initial 90-day mandate expires. International envoy Kofi Annan is due to brief the council on Wednesday on his bid to broker peace in Syria.

Syrian President Bashar Assad's forces have killed more than 15,000 people since a crackdown on pro-democracy protesters began in March 2011, some Western leaders say. Damascus says rebels have killed several thousand of its security forces.

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