HOUSTON (Reuters) – China’s proposed tariffs on U.S. petroleum imports, part of a mounting trade war between the two countries, would crimp sales to the shale industry’s largest customer, adding new pressure on U.S. crude prices, energy executives and analysts said in interviews this week. China has said it would slap a 25 percent tariff on imports of U.S. crude, natural gas and coal on July 6 if Washington went ahead, as planned, with its own tariffs on Chinese goods that day. Energy would be added for the first time to a burgeoning trade dispute that has hit imports of Chinese metals and solar panels, and exports of U.S. medical equipment and soybeans. Targeting petroleum puts the Trump administration’s “energy dominance” agenda in Beijing’s cross-hairs as U.S. shale has grabbed share […]