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Hundreds of thousands of civilians could be cut off from food if Syrian government forces encircle rebel-held parts of Aleppo, the United Nations said on Tuesday, warning of a massive new flight of refugees from a Russian-backed assault.

Syrian government forces, backed by Russian air strikes and Iranian and Lebanese Hezbollah fighters, have launched a major offensive in the countryside around Aleppo, which has been divided between government and rebel control for years.

The assault to surround Aleppo, once Syria’s biggest city with 2 million people, amounts to one of the most important shifts of momentum in the five year civil war that has killed 250,000 people and already driven 11 million from their homes.

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Ibrahim Ebu Leys/Anadolu Agency/Getty Images
The United Nations said Tuesday that up to 300,000 of civilians could be cut off from food and aid if Syrian government forces surround rebel-held parts of Aleppo.

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