The Pentagon has held a series of “deconfliction” talks with Russian counterparts to outline procedures in case of a mishap.

The Pentagon has asked Russia to stay away from parts of northern Syria where U.S. special operations troops are training local fighters to combat ISIS, military officials said Thursday.

The acknowledgement is significant because the Pentagon has repeatedly stressed it is not cooperating with Moscow as the two powers lead separate air campaigns in war-ravaged Syria.

Lieutenant General Charles Brown, who commands the U.S. air forces in the Middle East, said U.S. officials had asked Moscow to avoid “broad areas” in northern Syria “to maintain a level of safety for our forces that are on the ground.”

He added that Moscow had itself asked the U.S.-led coalition to avoid some of the airfields the Russian military is using.

“They don’t want us flying close to (these,)” Brown said. “Typically, we don’t fly there anyway. So, that hasn’t been an issue.”

Pentagon press secretary Peter Cook said Russia had honored the request, and stressed the Pentagon only provided broad geographic descriptions of where the U.S. troops are, not their precise location.

There was “one instance in which we have asked, for the safety of our special operators, (the Russians) to not engage in that particular geographical area,” Cook said. “We think it’s a reasonable request.”

The Pentagon last year said it was sending about 50 special operations forces to work with anti-ISIS fighters in Syria, though officials have said next to nothing about their whereabouts and progress since.

The United States has since August 2014 led an international coalition against ISIS in Iraq and Syria.

Russia entered the Syria conflict in September, when it began bombing rebels opposed to President Bashar al-Assad. Russia says it is attacking ISIS group and other “terrorists.”

Though coalition and Russian planes generally operate in different parts of the country, military officials fret about the possibility of an unintended clash between the two sides.

The Pentagon has held a series of “deconfliction” talks with Russian counterparts to outline procedures in case of a mishap.

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