Divorce terms first, referendum second

My  piece in the Washington Post this morning concludes: 

Washington can hope the Iraqi Kurds and Arabs will restrain themselves and negotiate a peaceful and mutually agreed outcome. But hope is not a policy. It is also still possible the referendum will be postponed, but if held, it is likely to undermine the fight against the Islamic State, heighten tension between Baghdad and Irbil, and cause fighting over the territories they dispute. It could also encourage independence movements in South Yemen, eastern Libya (Cyrenaica) and Syria as well as validate Russian-supported independence claims in Georgia, Moldova and Ukraine. None of that would be good for the United States, which should be doing what it can to block the referendum and insist on a successful negotiation before it is held, not afterwards.