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Russia has threatened to support Syrian Arab Army forces in retaking the country's At Tanf province, home of a critical U.S. training garrison, as the Idlib offensive in the north-west of the embattled country kicks off.

At Tanf, which is near the Iraq-Jordanian border is home to a forward operating base used by coalition forces to fight ISIS and train Syrian rebels as part of Operation Inherent Resolve.

The garrison was also the sight of a series of clashes between U.S.-led coalition forces and militias loyal to the government of Bashar al-Assad during the summer of 2017, clashes that raised the possibility of an armed conflict between Russian, Iranian, and U.S. proxy forces in the region.

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Read more on last year's clashes at At Tanf:

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