Brent crude and other benchmarks have pulled away from U.S. oil in recent days. (Getty Images) The energy shock from the Iran war is threatening to become a full-blown global crisis. But you wouldn't know it looking at U.S. oil prices. This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djr ...