Oil prices vaulted to their biggest gains in more than a month after Saudi Arabia and its allies launched a military campaign in neighboring Yemen, adding to concerns about the security of crude supplies in a region already fraught with tensions. The U.S. oil benchmark rose for the fifth straight session, surpassing $50 a barrel following the start of airstrikes to defend Yemen’s existing government against Iranian-backed rebels . While there were no immediate signs of any oil-supply disruption, the intervention by Saudi Arabia, the world’s No. 1 crude-oil exporter, stoked fears of a wider conflict among the biggest powers in the oil-rich region. Yemen itself produces a small amount of oil, but the country lies at the heart of some of the most important energy routes, with 7% of global oil maritime trade passing by its coast, according to U.S. Energy Information Administration estimates. Many traders and […]