A landmark United Nations-backed ceasefire has come into effect in Syria - the first major truce in a five-year civil war that has claimed more than 270,000 lives. Fighting raged right up until the ceasefire took force at midnight (8:00am AEST), but guns then fell silent in the Damascus suburbs and the devastated northern city of Aleppo, AFP correspondents said. Russia and the United States, the sponsors of the ceasefire deal, have said applying it will be difficult in a country that has been torn apart by a conflict that broke out in March 2011. US President Barack Obama has warned Damascus and its key ally Moscow that the "world will be watching". UN envoy Staffan de Mistura said Syria peace talks which collapsed earlier this month in Geneva would resume on March 7 if the ceasefire held and more aid was delivered. Less than an hour before the ceasefire, the UN Security Council gave its unanimous backing to a resolution drafted by the US and Russia, demanding that it be uphe...
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