Russia has said a resolution on Syria passed by the UN General Assembly undermines peace efforts there, as fighting continues on the ground.

Moscow's UN envoy, Vitaly Churkin, told reporters that the resolution was one-sided and gave blatant support to the armed opposition.

The resolution criticises both the UN's own Security Council and the government of Syrian President Bashar al-Assad.

Drafted by Saudi Arabia, it was passed by 133 votes to 12 with 31 abstentions.

The assembly debated the resolution shortly after the resignation of UN-Arab League envoy Kofi Annan and the failure of his six-point peace plan.