Iran is burying parts of its nuclear infrastructure because it is preparing for a U.S. strike, not an invasion. The U.S. has the ability to hit fixed targets inside Iran instantly, without moving ground forces, so the only plausible military scenario in view is a limited strike. Negotiations have continued through intermediaries. This week, Tehran said it was preparing a written proposal outlining terms for de-escalation. Washington, surprisingly, has kept public messaging tight (no cartoons on X). Talks are ongoing, but military options remain…