The United States sought on Wednesday to bolster its case for isolating Iran over its nuclear and regional activities by showing limpet mine fragments it said came from a damaged oil tanker and saying the ordnance looked Iranian in origin. The Islamic Republic has denied involvement in explosive strikes on two tankers in the Gulf of Oman last week and four tankers off the United Arab Emirates on May 12, both near the Strait of Hormuz, a major conduit for global oil supplies. But the incidents have fueled tensions that broke out with the U.S. pullout last year from world powers’ 2015 nuclear accord with Iran, followed by fresh U.S. sanctions to stifle Tehran’s vital oil trade, and a retaliatory Iranian threat this week to resume uranium enrichment in breach of the deal. France and Germany said on Wednesday they would crank up […]