The Pentagon disapproves of possible U.S.-Russia cooperation, although U.S. officials are not unhappy at the buffer Russia and Syria now appear to be creating between Turkey and the Kurds, or the prospect of the Syrian government moving into Manbij. A positive result, officials said, would not only prevent Turkish forces and their Syrian allies - many of whom are on the jihadist side of the anti-Assad rebel coalition - from moving into the town, but it would also potentially push any remaining YPF forces to the eastern side of the Euphrates.