... In the first place, the rebels still have time to formulate a strategy, organize a coherent military force and capture the areas still under Gaddafi's control.
...
Furthermore, with the no-fly zone in place, the air forces of the countries implementing the UN Security Council resolution can now focus their attention on the regime's supply lines and troop movements where these are judged to be a potential threat to civilians, as has happened in Misrata.
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Another factor that would work against the possibility of a long-term stalemate and the de facto division of Libya is the possibility of intervention by Western ground troops in areas where Gaddafi's forces might infiltrate into towns and cities and present a grave threat to the civilian population.
Although Security Council resolution explicitly excludes "a foreign occupation force of any form on any part of Libyan territory", it does not rule out targeted intervention by ground forces, for example, special forces sent in to take out snipers from residential centres.
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http://www.bbc.co.uk/news/world-middle-east-12842303