De-confliction…keeping Russian and American forces from fighting each other, even as their proxy warriors battle on in Syria has been working pretty well.  But as endgame in the war against the Islamic State gets nearer, James Sladden of the RAND Corporations says, de-confliction is getting harder to sustain.  The Euphrates River, once a dividing line, has been crossed by Russian allies, and US allies are both complaining and fighting back.