Western leaders are preparing for the possibility that Russian natural-gas flows through the key Nord Stream pipeline may never return to full levels. WSJ’s Shelby Holliday explains what an energy crisis could look like in Europe, and how it might ripple through the world. Illustration: David Fang The 14-year highs reached this week by U.S. natural-gas futures show the unceasing demand for U.S. shale gas across the Atlantic—and likely point to higher prices ahead. The latest price spike came in response to Russia’s plans to shut down one of Europe’s main fuel arteries for a few days at the end of the month. The shutdown announced Friday is either the latest episode of unplanned maintenance along the vital Nord Stream gas pipeline or an act of economic warfare on Russia’s part in retaliation for Western Europe’s support for Ukraine . Surging prices in Europe, weather that remains hotter than […]