The United States is setting up an air defence coordination unit in Qatar while publicly warning Iran about the use of lethal force. The unit itself is small and specific. It pulls together radar feeds, satellite warnings, and airspace tracking so U.S. systems and Gulf partners are looking at the same picture if something is launched. It does not plan strikes. It does not pick targets. It does not authorize action. Its job is to reduce confusion in the first minutes after an incident. The move raises the profile, but it is meant to contain what…