Syrian rebels back by the U.S. to topple Bashar al-Assad are being targeted by Russian fighters.

FOX News Radio's Jared Halpern has more from Washington:

Syrian rebels trained, armed, and funded through a C.I.A. program are being targeted by Russian airstrikes U.S. officials fear, one telling FOX News as many as 150 have been killed since Russia began operations supporting Syrian President Bashar Assad.

While not acknowledging the C.I.A. program publicly, President Obama has insisted the U.S. will not be pulled into a proxy war, all while warning Russian President Vladimir Putin about the consequences of propping up the Assad regime.

U.S. and Russian defense officials are set for a third round of talks on efforts to deconflict the skies in Syria.

In Washington, Jared Halpern, FOX News Radio.