Investors in Israel’s natural-gas fields agreed to supply an Egyptian company with gas valued at $15 billion, a deal that will build on growing ties between once-hostile neighbors that now share a common enemy in the restive Sinai Peninsula. Houston’s Noble Energy Inc. and Israel-based Delek Drilling LP will supply 83.2 billion cubic yards of natural gas over 10 years from the Tamar and Leviathan fields to Egypt’s Dolphinus Holdings Ltd , Delek said. Monday’s long-awaited gas deal represents a political boon for Israeli Prime Minister Benjamin Netanyahu, who has promoted exports to build diplomatic ties in the Middle East and beyond. Israeli officials hailed the deal as a step toward peace and regional cooperation. “This is a joyous day,” Mr. Netanyahu said. The deal could raise some tough questions for Egyptian President Abdel Fattah Al Sisi. He had promised to use gas from Egypt’s offshore fields to make […]