Later, Sebyan Hamo, a spokesman of the YPG, said: "we will liberate all those areas from IS and whoever tries to hinder our progress or attack us will receive our retaliation."

"We demand a clarification from Russia about the reasons behind hitting our forces," he continued.

The SDF and the Syrian army are fighting IS separately, and even though they haven't come to clash with one another, both don't seem on the same page.

The SDF has already been advancing in the northern city of Raqqa, the de facto capital of IS, capturing over 70 percent of the city with the help of the U.S.-led coalition.

While IS is the target, a possible confrontation between the SDF and the Syrian army doesn't seem impossible, but brewing until the final IS defeat.

Syrian officials repeatedly said that they will liberate all Syrian cities, hinting that even the areas under the SDF control will be retrieved.

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