Kremlin Plays Up Training With U.S. Over Syria; Pentagon Plays It Down

U.S. and Russian air force units have been working together to prevent mid-air incidents over Syria, reports Russia's Tass news agency.

Air and ground personnel conducted a joint exercise on Tuesday to practice interactions if their aircraft come close to each other over Syria, said Russian military officials.

The U.S. downplayed the cooperation. Pilots from both militaries conducted a communications test over Syria, the Pentagon said Tuesday.

"One U.S. fighter aircraft...