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TOPSHOT - Syrian volunteers carry an injured person on a stretcher following Syrian government forces airstrikes on the rebel held neighbourhood of Heluk in Aleppo, on September 30, 2016.
Syrian regime forces advanced in the battleground city of Aleppo, backed by a Russian air campaign that a monitor said has killed more than 3,800 civilians in the past year. / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP/Getty Images)
TOPSHOT - Syrian volunteers carry an injured person on a stretcher following Syrian government forces airstrikes on the rebel held neighbourhood of Heluk in Aleppo, on September 30, 2016.
Syrian regime forces advanced in the battleground city of Aleppo, backed by a Russian air campaign that a monitor said has killed more than 3,800 civilians in the past year. / AFP / THAER MOHAMMED        (Photo credit should read THAER MOHAMMED/AFP/Getty Images)

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    Russia warns US against attacking Syrian forces

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Russia warns US against attacking Syrian forces

As intense fighting continues in the besieged Syrian city Aleppo, Russia has issued a warning to the United States about taking direct action against the Syrian regime. CNN's Nic Robertson has more.

Russia warns US against attacking Syrian forces

As intense fighting continues in the besieged Syrian city Aleppo, Russia has issued a warning to the United States about taking direct action against the Syrian regime. CNN's Nic Robertson has more.