Saudi Arabia is struggling to maintain its share of the global oil market in a contest that pits the world’s largest crude exporter against traditional allies in the U.S. and Persian Gulf. The Saudi kingdom’s oil exports declined 5.7% in 2014 compared with 2013. Oil shipments to its fastest-expanding customer, China, reached their lowest levels since 2011 in the first two months of 2015, according to the China General Customs Administration. And its U.S. sales nearly halved in January compared with a year earlier, according to the U.S. Energy Information Administration. China and the U.S. are Saudi Arabia’s biggest importers, with 10% and 8%, respectively, of the kingdom’s production. In China, Saudi Arabia is suffering from depressed demand and better deals being offered by its rivals in Russia, Kuwait […]