In Syria, a Crisis of Cooperation

In conflict zones that draw the interest of the United States and its partners, Washington is often in the unenviable position of having to twist arms to achieve even the semblance of a coalition. So when two highly capable countries are aggressively trying to join a U.S.-led military campaign, the United States presumably has a good reason for responding with "thanks, but no thanks." This is the peculiar situation in which the United States finds itself in dealing with Russia and Turkey in the fight against the Islamic State in Syria....